Make scanner output look like a real scan.

- Estimate the true paper aspect from the perspective of the four corners
  (Zhang & He) and snap to A-series/Letter, instead of stretching to the
  longest edges.
- Keep native resolution (1754-3508px long side) and warp with cubic
  interpolation, trimming a thin border.
- Replace the global contrast tweak with OpenCV scan filters: illumination
  flattening (background division) plus ink levels and sharpening for
  color/gray, adaptive threshold for B&W, and an original mode.
- Export color pages as JPEG, size PDF pages to A4 and scale OCR text.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Jenkinsfile

@@ -0,0 +1,103 @@
+pipeline {
+  agent any
+
+  environment {
+    NODE_OPTIONS = '--max-old-space-size=8192'
+    NODE_IMAGE = 'node:22-bookworm'
+    REGISTRY = 'docker.sejong.dev'
+    IMAGE = 'docker.sejong.dev/sejong-office'
+    SSH_CONFIG_NAME = 'SEJONG-NAS'
+    DEPLOY_DIR = '/volume1/docker/sejong-office'
+  }
+
+  options {
+    timestamps()
+    buildDiscarder(logRotator(numToKeepStr: '20'))
+  }
+
+  stages {
+    stage('Type-check & Build') {
+      steps {
+        sh '''
+          set -eu
+          # DooD: docker.sock talks to the host daemon, so -v "$PWD" looks for
+          # that path on the NAS and fails. Reuse the agent container mounts.
+          if docker inspect "$(hostname)" >/dev/null 2>&1; then
+            set -- --volumes-from "$(hostname)" -w "$PWD"
+          else
+            set -- -v "$PWD":/app -w /app
+          fi
+          docker run --rm \
+            -u "$(id -u):$(id -g)" \
+            -e HOME=/tmp \
+            -e NODE_OPTIONS \
+            "$@" \
+            "$NODE_IMAGE" \
+            bash -lc 'npm ci && npm run build'
+        '''
+      }
+    }
+
+    stage('Release') {
+      when {
+        allOf {
+          not { changeRequest() }
+          anyOf {
+            branch 'main'
+            expression {
+              def branch = env.GIT_BRANCH ?: env.BRANCH_NAME ?: ''
+              branch == 'main' || branch == 'origin/main' || branch == 'refs/heads/main'
+            }
+          }
+        }
+      }
+      stages {
+        stage('Build & Push image') {
+          steps {
+            withCredentials([usernamePassword(
+              credentialsId: 'docker-sejong-dev',
+              usernameVariable: 'REGISTRY_USERNAME',
+              passwordVariable: 'REGISTRY_PASSWORD'
+            )]) {
+              sh '''
+                set -eu
+                echo "$REGISTRY_PASSWORD" | docker login "$REGISTRY" -u "$REGISTRY_USERNAME" --password-stdin
+                docker build -t "$IMAGE:latest" -t "$IMAGE:sha-${GIT_COMMIT}" .
+                docker push "$IMAGE:latest"
+                docker push "$IMAGE:sha-${GIT_COMMIT}"
+              '''
+            }
+          }
+          post {
+            always {
+              sh 'docker logout "$REGISTRY" || true'
+            }
+          }
+        }
+
+        stage('Deploy') {
+          steps {
+            sshPublisher(
+              failOnError: true,
+              publishers: [
+                sshPublisherDesc(
+                  configName: env.SSH_CONFIG_NAME,
+                  verbose: true,
+                  transfers: [
+                    sshTransfer(
+                      execTimeout: 1800000,
+                      usePty: true,
+                      execCommand: """
+                        sudo -n su -c 'set -eu; export PATH=/usr/local/bin:/usr/bin:/bin; cd "${env.DEPLOY_DIR}"; docker compose pull; docker compose up -d'
+                      """.stripIndent().trim()
+                    )
+                  ]
+                )
+              ]
+            )
+          }
+        }
+      }
+    }
+  }
+}

README.md

@@ -24,7 +24,18 @@
 cp .env.example .env
 # JWT_SECRET 을 긴 임의 문자열로 바꾸세요
 
-docker compose up --build
+# 로컬에서 이미지 빌드 (레지스트리 없이 테스트할 때)
+docker build -t docker.sejong.dev/sejong-office:latest .
+
+docker compose up -d
+```
+
+프로덕션(레지스트리 pull):
+
+```bash
+# 이미지: docker.sejong.dev/sejong-office:latest (호스트 고정)
+docker compose pull
+docker compose up -d
 ```
 
 - 앱: http://localhost:3000
@@ -32,6 +43,130 @@ docker compose up --build
 
 첫 Document Server 기동은 수 분 걸릴 수 있습니다. 프론트 빌드 시 Paddle OCR 모델·ORT WASM을 내려받으므로 네트워크와 디스크 여유가 필요합니다.
 
+### docker-compose 예시
+
+[`docker-compose.yml`](docker-compose.yml) — backend는 `docker.sejong.dev/sejong-office:latest`를 pull합니다. (아래는 값 고정 예시)
+
+```yaml
+services:
+  backend:
+    # 고정: 레지스트리 호스트 docker.sejong.dev, 이미지 sejong-office:latest
+    image: docker.sejong.dev/sejong-office:latest
+    ports:
+      # 변경: 호스트 포트 (왼쪽). 컨테이너는 3000 고정
+      - '3000:3000'
+    environment:
+      # 변경(필수): backend ↔ Document Server 공유 JWT. 긴 임의 문자열
+      JWT_SECRET: change-me-to-a-long-random-secret
+      # 변경: 브라우저가 접근하는 앱 공개 URL
+      PUBLIC_URL: https://office.example.com
+      # 보통 유지: compose 네트워크 안에서 backend 컨테이너 주소
+      INTERNAL_URL: http://backend:3000
+      # 변경: 브라우저가 접근하는 Document Server 공개 URL
+      ONLYOFFICE_URL: https://office.example.com/ds
+      # 보통 유지: compose 네트워크 안 Document Server 주소
+      ONLYOFFICE_INTERNAL_URL: http://documentserver
+      # 변경 가능: 세션 TTL(ms). 기본 15분
+      SESSION_TTL_MS: '900000'
+      # 유지: 컨테이너 내 임시 문서 경로 (아래 tmpfs와 맞출 것)
+      TEMP_DIR: /tmp/sejong
+      # 유지: 컨테이너 리스닝 포트
+      PORT: 3000
+      # 변경 가능: 업로드 최대 크기(MB)
+      MAX_UPLOAD_MB: '50'
+    tmpfs:
+      # 변경 가능: 임시 저장 용량. TEMP_DIR 과 경로 일치
+      - /tmp/sejong:size=512m,mode=1777
+    depends_on:
+      - documentserver
+    restart: unless-stopped
+
+  documentserver:
+    # 유지 권장: 버전 태그 pin
+    image: ghcr.io/euro-office/documentserver:v9.3.2
+    ports:
+      # 변경: 호스트 포트 (왼쪽). 프록시만 쓸 거면 공개 안 해도 됨
+      - '8080:80'
+    environment:
+      JWT_ENABLED: 'true'
+      # 변경(필수): backend 의 JWT_SECRET 과 반드시 동일
+      JWT_SECRET: change-me-to-a-long-random-secret
+      JWT_HEADER: Authorization
+      JWT_IN_BODY: 'true'
+    volumes:
+      - documentserver_data:/var/www/onlyoffice/Data
+    restart: unless-stopped
+
+volumes:
+  documentserver_data:
+```
+
+## CI/CD (Jenkins)
+
+[`Jenkinsfile`](Jenkinsfile) 이 `main` PR/브랜치에서 `npm ci` + `npm run build`를 돌리고, **`main` 브랜치 빌드**(PR 제외)에서만 이미지를 push한 뒤 서버에 SSH로 배포합니다.
+
+에이전트에 Docker가 있어야 합니다. Node 22는 `node:22-bookworm` 컨테이너로 돌리며, Vite 힙 한도는 `NODE_OPTIONS=--max-old-space-size=8192`입니다.
+
+푸시 태그: `docker.sejong.dev/sejong-office:latest`, `docker.sejong.dev/sejong-office:sha-<commit>`
+
+배포는 [Publish Over SSH](https://plugins.jenkins.io/publish-over-ssh/)로 파일을 올리지 않고, 서버에 이미 있는 `docker-compose.yml` 디렉터리에서 `docker compose pull && docker compose up -d`만 실행합니다.
+
+### Jenkins Credentials
+
+Username/password 자격 증명 ID: `docker-sejong-dev`
+
+| 필드 | 설명 |
+|------|------|
+| Username | push 전용 계정 |
+| Password | push 전용 토큰 (write) |
+
+레지스트리 호스트는 `docker.sejong.dev`로 고정입니다. PR 빌드는 이 자격 증명을 쓰지 않습니다. 에이전트에 상시 `docker login` 하지 마세요.
+
+Multibranch Pipeline(또는 Gitea/Git 브랜치 소스)로 이 레포를 연결하면 PR과 `main`이 각각 잡으로 뜹니다.
+
+### Publish Over SSH
+
+1. Jenkins에 **Publish Over SSH** 플러그인 설치
+2. **Manage Jenkins → System → Publish over SSH** 에 배포 서버 등록 (호스트, 사용자, 키 또는 비밀번호)
+3. 등록한 **Name**이 Jenkinsfile의 `SSH_CONFIG_NAME`과 같아야 함 (`SEJONG-NAS`)
+4. 배포 명령은 SSH 접속 후 `sudo -n su -c '...'` 로 root에서 실행함. 대화형 `sudo su`와 비밀번호 입력은 CI에서 불가
+5. Publish Over SSH에 넣은 **그 계정**으로 서버에 로그인한 뒤, 한 번만 NOPASSWD를 설정:
+
+```bash
+sudo visudo -f /etc/sudoers.d/sejong-office-deploy
+```
+
+파일 내용 (SSH 사용자 이름으로 바꿀 것):
+
+```
+youruser ALL=(ALL) NOPASSWD: /bin/su, /usr/bin/su
+```
+
+저장 후 비밀번호 없이 root가 되는지 확인:
+
+```bash
+sudo -n su -c 'whoami'
+# root
+```
+
+`sudo -n`은 비밀번호를 묻지 않고, 설정이 안 되어 있으면 바로 실패합니다. Jenkinsfile에 비밀번호를 넣지 마세요.
+
+비로그인 SSH의 PATH에는 `/usr/local/bin`이 없어서 시놀로지의 `docker`를 못 찾습니다. 그래서 배포 명령이 PATH를 직접 지정합니다. 다음이 같은 결과여야 합니다:
+
+```bash
+ssh -T youruser@nas "sudo -n su -c 'export PATH=/usr/local/bin:/usr/bin:/bin; command -v docker'"
+# /usr/local/bin/docker
+```
+
+서버 compose 경로는 Jenkinsfile `DEPLOY_DIR` (`/volume1/docker/sejong-office`)입니다. 이름이나 경로가 다르면 Jenkinsfile을 수정하면 됩니다.
+
+### 서버 배포 체크리스트
+
+1. 배포 디렉터리에 `docker-compose.yml`과 `.env`를 두고, **pull 전용** 토큰으로 `docker login docker.sejong.dev` (CI push 토큰과 분리)
+2. `.env`에 `JWT_SECRET`, URL 설정
+3. `main` 배포 잡이 이미지 push 후 그 디렉터리에서 compose pull/up 실행
+4. `JWT_SECRET`은 Git·이미지·Jenkins Credential에 넣지 않음 (서버 `.env`만)
+
 ## 로컬 개발
 
 ```bash

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   backend:
-    build: .
+    image: docker.sejong.dev/sejong-office:latest
     ports:
       - '3000:3000'
     environment:

package-lock.json

@@ -3775,6 +3775,16 @@
         "@types/d3-selection": "*"
       }
     },
+    "node_modules/@types/dompurify": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/@types/dompurify/-/dompurify-3.0.5.tgz",
+      "integrity": "sha512-1Wg0g3BtQF7sSb27fJQAKck1HECM6zV1EB66j8JH9i3LCjYabJa0FSdiSgsD5K/RbrsR0SiraKacLB+T8ZVYAg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/trusted-types": "*"
+      }
+    },
     "node_modules/@types/estree": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
@@ -3973,8 +3983,8 @@
       "version": "2.0.7",
       "resolved": "https://registry.npmjs.org/@types/trusted-types/-/trusted-types-2.0.7.tgz",
       "integrity": "sha512-ScaPdn1dQczgbl0QFTeTOmVHFULt394XJgOQNoyVhZ6r2vLnMLJfBPd53SB52T/3G36VI1/g2MZaX0cwDuXsfw==",
-      "license": "MIT",
+      "devOptional": true,
-      "optional": true
+      "license": "MIT"
     },
     "node_modules/@types/web-bluetooth": {
       "version": "0.0.20",
@@ -4309,6 +4319,22 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/ag-psd": {
+      "version": "31.0.2",
+      "resolved": "https://registry.npmjs.org/ag-psd/-/ag-psd-31.0.2.tgz",
+      "integrity": "sha512-5s5PvqbomPIIJ9YjL6robz55rT4RYPiQkww4brisyZEb5jzlHB1EKh47IJg7gIFj0RUrD0cMgdntM907qaZjXA==",
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "1.5.1",
+        "pako": "2.1.0"
+      }
+    },
+    "node_modules/ag-psd/node_modules/pako": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/pako/-/pako-2.1.0.tgz",
+      "integrity": "sha512-w+eufiZ1WuJYgPXbV/PO3NCMEc3xqylkKHzp8bxp1uW4qaSNQUkwmLLEc3kKsfz8lpV1F8Ht3U1Cm+9Srog2ug==",
+      "license": "(MIT AND Zlib)"
+    },
     "node_modules/ai": {
       "version": "5.0.217",
       "resolved": "https://registry.npmjs.org/ai/-/ai-5.0.217.tgz",
@@ -5529,9 +5555,9 @@
       "license": "MIT"
     },
     "node_modules/dompurify": {
-      "version": "3.4.12",
+      "version": "3.4.15",
-      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-3.4.12.tgz",
+      "resolved": "https://registry.npmjs.org/dompurify/-/dompurify-3.4.15.tgz",
-      "integrity": "sha512-zQvGet8Z2sWbQhCmfFz/T5QWH2oBmjnqK3qvOjaqaNLrLEF912WamU+ohnTp0TCep/MFVHpdJuCZEdFOdTnEFg==",
+      "integrity": "sha512-EUBjM+B+lkDE41iE82DDSCfkoPGfXx8IxFxPMjNzm/Uk4xDet77rTN9wqlxlVg71kK7XGuUMv6wUxJUwwv+Xyw==",
       "license": "(MPL-2.0 OR Apache-2.0)",
       "optionalDependencies": {
         "@types/trusted-types": "^2.0.7"
@@ -9349,11 +9375,14 @@
         "@pdf-lib/fontkit": "^1.1.1",
         "@rhwp/editor": "^0.7.18",
         "@vueuse/core": "^11.3.0",
+        "ag-psd": "^31.0.2",
+        "dompurify": "^3.4.15",
         "draco3d": "^1.5.7",
         "element-plus": "^2.14.3",
         "fflate": "^0.8.2",
         "jscanify": "^1.4.3",
         "lodash-es": "^4.17.21",
+        "marked": "^16.4.2",
         "mermaid": "^11.16.0",
         "occt-import-js": "^0.0.22",
         "online-3d-viewer": "^0.18.0",
@@ -9374,6 +9403,7 @@
         "@fontsource-variable/noto-sans-kr": "^5.3.0",
         "@fontsource/noto-sans-kr": "^5.3.0",
         "@noto-pdf-ts/fonts-kr": "^0.0.1-alpha.0",
+        "@types/dompurify": "^3.0.5",
         "@types/react": "^19.2.17",
         "@types/react-dom": "^19.2.3",
         "@types/three": "^0.172.0",

packages/backend/src/index.ts

@@ -4,6 +4,7 @@ import cookieParser from 'cookie-parser';
 import path from 'node:path';
 import fs from 'node:fs';
 import { config } from './config.js';
+import { logger, requestLogger } from './logger.js';
 import { sessionsRouter } from './routes/sessions.js';
 import { documentsRouter } from './routes/documents.js';
 import {
@@ -18,6 +19,7 @@ async function main() {
 
   const app = express();
 
+  app.use(requestLogger);
   app.use(
     cors({
       origin: true,
@@ -61,16 +63,23 @@ async function main() {
     });
   }
 
+  app.use((err: unknown, req: express.Request, res: express.Response, _next: express.NextFunction) => {
+    logger.error('Unhandled request error', { err, path: req.path });
+    if (!res.headersSent) {
+      res.status(500).json({ error: 'internal_server_error' });
+    }
+  });
+
   startSweeper();
 
   app.listen(config.port, () => {
-    console.log(`[sejong-office] listening on :${config.port}`);
+    logger.info(`Backend listening on :${config.port}`);
-    console.log(`[sejong-office] tempDir=${config.tempDir}`);
+    logger.info(`Temp directory: ${config.tempDir}`);
-    console.log(`[sejong-office] publicUrl=${config.publicUrl}`);
+    logger.info(`Public URL: ${config.publicUrl}`);
   });
 }
 
 main().catch((err) => {
-  console.error(err);
+  logger.error('Backend failed to start', { err });
   process.exit(1);
 });

packages/backend/src/logger.ts

@@ -0,0 +1,92 @@
+import type { RequestHandler } from 'express';
+
+type LogLevel = 'INFO' | 'WARN' | 'ERROR';
+type LogDetails = Record<string, unknown>;
+
+function formatDetails(details?: LogDetails): string {
+  if (!details) return '';
+  const normalized = Object.fromEntries(
+    Object.entries(details).map(([key, value]) => [
+      key,
+      value instanceof Error ? value.stack ?? value.message : value,
+    ]),
+  );
+  return ` ${JSON.stringify(normalized)}`;
+}
+
+function write(level: LogLevel, message: string, details?: LogDetails) {
+  const line = `[${new Date().toISOString()}] [${level}] ${message}${formatDetails(details)}`;
+  if (level === 'ERROR') {
+    console.error(line);
+  } else if (level === 'WARN') {
+    console.warn(line);
+  } else {
+    console.log(line);
+  }
+}
+
+export const logger = {
+  info: (message: string, details?: LogDetails) =>
+    write('INFO', message, details),
+  warn: (message: string, details?: LogDetails) =>
+    write('WARN', message, details),
+  error: (message: string, details?: LogDetails) =>
+    write('ERROR', message, details),
+};
+
+function browserSummary(userAgent = ''): string {
+  const browsers: [RegExp, string][] = [
+    [/Edg\/([\d.]+)/, 'Edge'],
+    [/OPR\/([\d.]+)/, 'Opera'],
+    [/Chrome\/([\d.]+)/, 'Chrome'],
+    [/Firefox\/([\d.]+)/, 'Firefox'],
+    [/Version\/([\d.]+).*Safari\//, 'Safari'],
+    [/curl\/([\d.]+)/, 'curl'],
+  ];
+  const browser = browsers
+    .map(([pattern, name]) => {
+      const match = userAgent.match(pattern);
+      return match ? `${name} ${match[1]}` : null;
+    })
+    .find(Boolean) ?? 'Unknown';
+
+  const os = /Windows NT/.test(userAgent)
+    ? 'Windows'
+    : /Android/.test(userAgent)
+      ? 'Android'
+      : /iPhone|iPad/.test(userAgent)
+        ? 'iOS'
+        : /Mac OS X/.test(userAgent)
+          ? 'macOS'
+          : /Linux/.test(userAgent)
+            ? 'Linux'
+            : 'Unknown';
+
+  return `${browser} / ${os}`;
+}
+
+function requestIp(forwardedFor: string | string[] | undefined, remote?: string) {
+  const forwarded = Array.isArray(forwardedFor)
+    ? forwardedFor[0]
+    : forwardedFor?.split(',')[0]?.trim();
+  return (forwarded || remote || '-').replace(/^::ffff:/, '');
+}
+
+export const requestLogger: RequestHandler = (req, res, next) => {
+  const startedAt = performance.now();
+  res.on('finish', () => {
+    const durationMs = Math.round(performance.now() - startedAt);
+    const ip = requestIp(
+      req.headers['x-forwarded-for'],
+      req.socket.remoteAddress,
+    );
+    const browser = browserSummary(req.headers['user-agent']);
+    const message =
+      `${req.method} ${req.originalUrl} ${res.statusCode} ${durationMs}ms` +
+      ` ip=${ip} browser="${browser}"`;
+    if (res.statusCode >= 500) logger.error(message);
+    else if (res.statusCode >= 400) logger.warn(message);
+    else logger.info(message);
+  });
+  next();
+};

packages/backend/src/routes/documents.ts

@@ -2,16 +2,16 @@ import { Router } from 'express';
 import multer from 'multer';
 import fs from 'node:fs/promises';
 import { config, OFFICE_EXTENSIONS } from '../config.js';
+import { logger } from '../logger.js';
 import { requireSession } from '../middleware/session.js';
 import {
   addDocument,
   deleteDocument,
   getDocument,
-  overwriteDocument,
 } from '../services/sessionStore.js';
 import {
   buildEditorConfig,
-  convertToOriginalFormat,
+  persistDocumentFromUrl,
 } from '../services/onlyOffice.js';
 import {
   createBlankDocument,
@@ -51,7 +51,7 @@ documentsRouter.post('/new', requireSession, async (req, res) => {
       token: doc.token,
     });
   } catch (err) {
-    console.error(err);
+    logger.error('Failed to create blank document', { err });
     res.status(500).json({ error: 'create_failed' });
   }
 });
@@ -97,7 +97,7 @@ documentsRouter.post(
         documentType: doc.documentType,
       });
     } catch (err) {
-      console.error(err);
+      logger.error('Failed to upload document', { err });
       res.status(500).json({ error: 'upload_failed' });
     }
   },
@@ -148,7 +148,7 @@ documentsRouter.post('/:docId/callback', async (req, res) => {
       verifyOnlyOfficeToken(token);
     }
   } catch (err) {
-    console.error('[callback] jwt invalid', err);
+    logger.warn('Invalid callback JWT', { err, docId: req.params.docId });
     res.status(403).json({ error: 1 });
     return;
   }
@@ -187,35 +187,12 @@ documentsRouter.post('/:docId/callback', async (req, res) => {
     }
 
     try {
-      const downloaded = await fetch(fileUrl);
+      await persistDocumentFromUrl(doc, fileUrl, filetype);
-      if (!downloaded.ok) {
-        console.error('[callback] download failed', downloaded.status);
-        res.json({ error: 1 });
-        return;
-      }
-
-      let buffer: Buffer = Buffer.from(await downloaded.arrayBuffer());
-      const returnedType = (filetype ?? doc.fileType).toLowerCase();
-
-      if (returnedType !== doc.fileType) {
-        const converted = await convertToOriginalFormat(
-          fileUrl,
-          returnedType,
-          doc.fileType,
-        );
-        if (!converted) {
-          console.error(
-            `[callback] refused save: got ${returnedType}, need ${doc.fileType}`,
-          );
-          res.json({ error: 1 });
-          return;
-        }
-        buffer = Buffer.from(converted);
-      }
-
-      await overwriteDocument(doc, buffer, doc.fileType);
     } catch (err) {
-      console.error('[callback] save error', err);
+      logger.error('Failed to save callback document', {
+        err,
+        docId: req.params.docId,
+      });
       res.json({ error: 1 });
       return;
     }

packages/backend/src/services/onlyOffice.ts

@@ -1,5 +1,7 @@
 import { config } from '../config.js';
+import { logger } from '../logger.js';
 import type { SessionDoc } from '../types/session.js';
+import { overwriteDocument } from './sessionStore.js';
 import { signOnlyOfficePayload } from '../utils/jwt.js';
 
 export function buildEditorConfig(doc: SessionDoc, userId: string) {
@@ -49,6 +51,59 @@ export function buildEditorConfig(doc: SessionDoc, userId: string) {
   };
 }
 
+/** Prefer the internal Document Server base when the backend fetches the file. */
+export function toInternalOnlyOfficeUrl(raw: string): string {
+  try {
+    const target = new URL(raw);
+    const publicBase = new URL(config.onlyOfficeUrl);
+    const internalBase = new URL(config.onlyOfficeInternalUrl);
+    if (
+      target.host === publicBase.host ||
+      target.host === internalBase.host
+    ) {
+      target.protocol = internalBase.protocol;
+      target.host = internalBase.host;
+    }
+    return target.toString();
+  } catch {
+    return raw;
+  }
+}
+
+/**
+ * Download an OnlyOffice-produced file URL and overwrite the session document
+ * (converting back to the original extension when needed).
+ */
+export async function persistDocumentFromUrl(
+  doc: SessionDoc,
+  fileUrl: string,
+  filetype?: string,
+): Promise<Buffer> {
+  const fetchUrl = toInternalOnlyOfficeUrl(fileUrl);
+  const downloaded = await fetch(fetchUrl);
+  if (!downloaded.ok) {
+    throw new Error(`download_failed_${downloaded.status}`);
+  }
+
+  let buffer: Buffer = Buffer.from(await downloaded.arrayBuffer());
+  const returnedType = (filetype ?? doc.fileType).toLowerCase();
+
+  if (returnedType !== doc.fileType) {
+    const converted = await convertToOriginalFormat(
+      fetchUrl,
+      returnedType,
+      doc.fileType,
+    );
+    if (!converted) {
+      throw new Error(`convert_failed:${returnedType}->${doc.fileType}`);
+    }
+    buffer = Buffer.from(converted);
+  }
+
+  await overwriteDocument(doc, buffer, doc.fileType);
+  return buffer;
+}
+
 export async function convertToOriginalFormat(
   sourceUrl: string,
   fromExt: string,
@@ -80,7 +135,9 @@ export async function convertToOriginalFormat(
     });
 
     if (!res.ok) {
-      console.error('[convert] HTTP', res.status);
+      logger.error('OnlyOffice conversion HTTP error', {
+        statusCode: res.status,
+      });
       return null;
     }
 
@@ -91,7 +148,10 @@ export async function convertToOriginalFormat(
     };
 
     if (data.error || !data.fileUrl) {
-      console.error('[convert] failed', data);
+      logger.error('OnlyOffice conversion failed', {
+        errorCode: data.error,
+        hasFileUrl: Boolean(data.fileUrl),
+      });
       return null;
     }
 
@@ -99,7 +159,7 @@ export async function convertToOriginalFormat(
     if (!fileRes.ok) return null;
     return Buffer.from(await fileRes.arrayBuffer());
   } catch (err) {
-    console.error('[convert] error', err);
+    logger.error('OnlyOffice conversion error', { err });
     return null;
   }
 }

packages/backend/src/services/sessionStore.ts

@@ -3,6 +3,7 @@ import path from 'node:path';
 import { randomBytes } from 'node:crypto';
 import { v4 as uuidv4 } from 'uuid';
 import { config } from '../config.js';
+import { logger } from '../logger.js';
 import type { Session, SessionDoc } from '../types/session.js';
 import { documentTypeFor, mimeFor } from '../utils/formats.js';
 
@@ -151,10 +152,14 @@ export async function sweepExpired(): Promise<number> {
 
 export function startSweeper(intervalMs = 60_000): NodeJS.Timeout {
   return setInterval(() => {
-    void sweepExpired().then((n) => {
+    void sweepExpired()
+      .then((n) => {
         if (n > 0) {
-        console.log(`[session] swept ${n} expired session(s)`);
+          logger.info(`Swept ${n} expired session(s)`);
         }
+      })
+      .catch((err) => {
+        logger.error('Failed to sweep expired sessions', { err });
       });
   }, intervalMs);
 }

packages/frontend/index.html

@@ -10,11 +10,11 @@
       type="image/svg+xml"
       href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%230f6cbd' d='M9,13H15V19H18V10L12,5.5L6,10V19H9V13M4,21V9L12,3L20,9V21H4Z'/%3E%3C/svg%3E"
     />
-    <link rel="preconnect" href="https://fonts.googleapis.com" />
-    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
     <link
-      href="https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+KR:wght@400;500;600;700&display=swap"
       rel="stylesheet"
+      as="style"
+      crossorigin
+      href="https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable.min.css"
     />
   </head>
   <body>

packages/frontend/package.json

@@ -26,11 +26,14 @@
     "@pdf-lib/fontkit": "^1.1.1",
     "@rhwp/editor": "^0.7.18",
     "@vueuse/core": "^11.3.0",
+    "ag-psd": "^31.0.2",
+    "dompurify": "^3.4.15",
     "draco3d": "^1.5.7",
     "element-plus": "^2.14.3",
     "fflate": "^0.8.2",
     "jscanify": "^1.4.3",
     "lodash-es": "^4.17.21",
+    "marked": "^16.4.2",
     "mermaid": "^11.16.0",
     "occt-import-js": "^0.0.22",
     "online-3d-viewer": "^0.18.0",
@@ -51,6 +54,7 @@
     "@fontsource-variable/noto-sans-kr": "^5.3.0",
     "@fontsource/noto-sans-kr": "^5.3.0",
     "@noto-pdf-ts/fonts-kr": "^0.0.1-alpha.0",
+    "@types/dompurify": "^3.0.5",
     "@types/react": "^19.2.17",
     "@types/react-dom": "^19.2.3",
     "@types/three": "^0.172.0",

packages/frontend/scripts/copy-viewer-assets.mjs

@@ -356,6 +356,46 @@ const replacements = [
   ],
 ];
 
+/**
+ * CDN builds load OCCT via a blob Worker + importScripts. That fails for
+ * self-hosted absolute paths in some browsers. Use a same-origin Worker URL.
+ */
+function patchCreateOcctWorker(source) {
+  const moduleRe =
+    /function CreateOcctWorker\s*\([^)]*\)\s*\{[\s\S]*?URL\.createObjectURL\s*\(\s*blob\s*\)[\s\S]*?\}\s*(?=\s*function LoadExternalLibrary)/;
+  const moduleNext = `function CreateOcctWorker (worker)
+{
+	return new Promise ((resolve, reject) => {
+		try {
+			if (occtWorkerUrl === null) {
+				occtWorkerUrl = '${O3DV_BASE}occt-import-js-worker.js';
+			}
+			resolve (new Worker (occtWorkerUrl));
+		} catch (error) {
+			reject (error);
+		}
+	});
+}
+
+`;
+
+  const minRe =
+    /function Wo\(r\)\{return new Promise\(\(e,t\)=>\{if\(vu!==null\)\{e\(new Worker\(vu\)\);return\}[\s\S]*?URL\.createObjectURL\(s\),e\(new Worker\(vu\)\)\}\)\.catch\(t\)\}\)\}/;
+  const minNext = `function Wo(r){return new Promise((e,t)=>{try{vu===null&&(vu="${O3DV_BASE}occt-import-js-worker.js"),e(new Worker(vu))}catch(n){t(n)}})}`;
+
+  let next = source;
+  let changed = false;
+  if (moduleRe.test(next)) {
+    next = next.replace(moduleRe, moduleNext);
+    changed = true;
+  }
+  if (minRe.test(next)) {
+    next = next.replace(minRe, minNext);
+    changed = true;
+  }
+  return { source: next, changed };
+}
+
 async function patchO3dvFile(relativePath) {
   for (const candidate of resolvePackage(relativePath)) {
     try {
@@ -367,17 +407,46 @@ async function patchO3dvFile(relativePath) {
           changed = true;
         }
       }
+      const occt = patchCreateOcctWorker(source);
+      source = occt.source;
+      changed = changed || occt.changed;
       if (changed) {
         await writeFile(candidate, source);
         console.log(`patched ${candidate}`);
+      } else if (!source.includes(`${O3DV_BASE}occt-import-js-worker.js`)) {
+        throw new Error(
+          `OCCT worker patch did not apply for ${candidate}`,
+        );
       }
       return;
-    } catch {
+    } catch (error) {
+      if (error && /OCCT worker patch/.test(String(error.message))) throw error;
       // try next path
     }
   }
   throw new Error(`Could not patch ${relativePath}`);
 }
 
+await writeFile(
+  path.join(publicDir, 'viewer-assets/o3dv/occt-import-js-worker.js'),
+  [
+    `importScripts('${O3DV_BASE}occt-import-js.js');`,
+    '',
+    'onmessage = async function (ev)',
+    '{',
+    '\tlet modulOverrides = {',
+    '\t\tlocateFile: function (path) {',
+    `\t\t\treturn '${O3DV_BASE}' + String(path).split('/').pop();`,
+    '\t\t}',
+    '\t};',
+    '\tlet occt = await occtimportjs (modulOverrides);',
+    '\tlet result = occt.ReadFile (ev.data.format, ev.data.buffer, ev.data.params);',
+    '\tpostMessage (result);',
+    '};',
+    '',
+  ].join('\n'),
+);
+console.log('wrote self-hosted occt-import-js-worker.js');
+
 await patchO3dvFile('online-3d-viewer/build/engine/o3dv.module.js');
 await patchO3dvFile('online-3d-viewer/build/engine/o3dv.min.js');

packages/frontend/src/App.vue

@@ -1,7 +1,10 @@
 <script setup lang="ts">
 import { computed } from 'vue';
 import { useRoute } from 'vue-router';
-import { bindSessionPageHideOnce } from '@/composables/useSessionLifecycle';
+import {
+  bindSessionPageHideOnce,
+  hwpOpenToken,
+} from '@/composables/useSessionLifecycle';
 
 bindSessionPageHideOnce();
 
@@ -12,8 +15,9 @@ const viewKey = computed(() => {
   if (route.name === 'onlyoffice-editor') {
     return `onlyoffice-${route.params.docId}`;
   }
+  // Token changes on every staged HWP open so the view remounts with the new file.
   if (route.name === 'rhwp-editor') {
-    return 'rhwp-editor';
+    return `rhwp-${hwpOpenToken()}`;
   }
   if (
     route.name === 'excalidraw-editor' ||
@@ -21,7 +25,12 @@ const viewKey = computed(() => {
     route.name === 'drawio-editor' ||
     route.name === 'cad-viewer' ||
     route.name === 'model3d-viewer' ||
-    route.name === 'tools-scanner'
+    route.name === 'illustrator-viewer' ||
+    route.name === 'photoshop-viewer' ||
+    route.name === 'markdown-viewer' ||
+    route.name === 'tools-scanner' ||
+    route.name === 'tools-bg-remove' ||
+    route.name === 'tools-image-edit'
   ) {
     return String(route.name);
   }
@@ -34,13 +43,17 @@ const viewKey = computed(() => {
     <KeepAlive
       :include="[
         'OnlyOfficeEditorView',
-        'RhwpEditorView',
         'ExcalidrawEditorView',
         'MermaidEditorView',
         'DrawioEditorView',
         'CadViewerView',
         'Model3DViewerView',
+        'IllustratorViewerView',
+        'PhotoshopViewerView',
+        'MarkdownViewerView',
         'ToolsScannerView',
+        'ToolsBgRemoveView',
+        'ToolsImageEditView',
       ]"
       :max="10"
     >

packages/frontend/src/api/client.ts

@@ -35,11 +35,19 @@ export async function createSession(): Promise<{
 }
 
 export async function heartbeat(): Promise<void> {
-  await fetch('/api/sessions/heartbeat', {
+  const res = await fetch('/api/sessions/heartbeat', {
     method: 'POST',
     credentials: 'include',
   });
+  if (!res.ok) {
+    throw new ApiError(
+      res.status,
+      'session_required',
+      '세션이 만료되었거나 없습니다.',
+    );
   }
+}
+
 
 export async function endSession(): Promise<void> {
   await fetch('/api/sessions', {
@@ -116,7 +124,3 @@ export async function fetchEditorConfig(
     }),
   );
 }
-
-export function downloadDocumentUrl(docId: string): string {
-  return `/api/documents/${docId}/download`;
-}

packages/frontend/src/components/DownloadGuideModal.vue

@@ -0,0 +1,156 @@
+<script setup lang="ts">
+import { onMounted, onUnmounted, watch } from 'vue';
+
+const props = withDefaults(
+  defineProps<{
+    open?: boolean;
+    title?: string;
+    lead?: string;
+    steps?: string[];
+    pathHint?: string;
+  }>(),
+  {
+    open: false,
+    title: '다운로드 방법',
+    lead: '',
+    steps: () => [],
+    pathHint: '',
+  },
+);
+
+const emit = defineEmits<{
+  close: [];
+}>();
+
+function onKeydown(e: KeyboardEvent) {
+  if (!props.open) return;
+  if (e.key === 'Escape') emit('close');
+}
+
+onMounted(() => {
+  window.addEventListener('keydown', onKeydown);
+});
+
+onUnmounted(() => {
+  window.removeEventListener('keydown', onKeydown);
+  if (typeof document !== 'undefined') {
+    document.body.style.overflow = '';
+  }
+});
+
+watch(
+  () => props.open,
+  (open) => {
+    if (typeof document === 'undefined') return;
+    document.body.style.overflow = open ? 'hidden' : '';
+  },
+);
+</script>
+
+<template>
+  <Teleport to="body">
+    <div
+      v-if="open"
+      class="guide"
+      role="dialog"
+      aria-modal="true"
+      aria-labelledby="download-guide-title"
+      @click.self="emit('close')"
+    >
+      <div class="guide__panel">
+        <h2 id="download-guide-title" class="guide__title">{{ title }}</h2>
+        <p v-if="lead" class="guide__lead">{{ lead }}</p>
+        <ol v-if="steps.length" class="guide__steps">
+          <li v-for="(step, i) in steps" :key="i">{{ step }}</li>
+        </ol>
+        <p v-if="pathHint" class="guide__path" aria-hidden="true">
+          {{ pathHint }}
+        </p>
+        <div class="guide__actions">
+          <button type="button" class="guide__btn" @click="emit('close')">
+            확인
+          </button>
+        </div>
+      </div>
+    </div>
+  </Teleport>
+</template>
+
+<style scoped>
+.guide {
+  position: fixed;
+  inset: 0;
+  z-index: 40;
+  display: grid;
+  place-items: center;
+  padding: 1.25rem;
+  background: rgb(0 0 0 / 45%);
+}
+
+.guide__panel {
+  width: min(420px, 100%);
+  padding: 1.25rem 1.35rem 1.1rem;
+  border-radius: 10px;
+  border: 1px solid var(--border);
+  background: var(--surface);
+  color: var(--ink);
+  box-shadow: 0 12px 40px rgb(0 0 0 / 18%);
+}
+
+.guide__title {
+  margin: 0 0 0.5rem;
+  font-size: 1.1rem;
+  font-weight: 650;
+}
+
+.guide__lead {
+  margin: 0 0 0.85rem;
+  font-size: 0.9rem;
+  color: var(--ink-soft);
+  line-height: 1.45;
+}
+
+.guide__steps {
+  margin: 0 0 0.85rem;
+  padding-left: 1.2rem;
+  font-size: 0.9rem;
+  line-height: 1.55;
+  color: var(--ink);
+}
+
+.guide__steps li + li {
+  margin-top: 0.35rem;
+}
+
+.guide__path {
+  margin: 0 0 1.1rem;
+  padding: 0.55rem 0.7rem;
+  border-radius: 6px;
+  background: var(--accent-soft);
+  color: var(--accent);
+  font-size: 0.82rem;
+  font-weight: 600;
+  letter-spacing: -0.01em;
+}
+
+.guide__actions {
+  display: flex;
+  justify-content: flex-end;
+}
+
+.guide__btn {
+  font: inherit;
+  font-size: 0.88rem;
+  font-weight: 600;
+  padding: 0.45rem 1rem;
+  border-radius: 6px;
+  border: none;
+  background: var(--accent);
+  color: #fff;
+  cursor: pointer;
+}
+
+.guide__btn:hover {
+  filter: brightness(1.05);
+}
+</style>

packages/frontend/src/components/EditorToolbar.vue

@@ -9,7 +9,7 @@ withDefaults(
     busy?: boolean;
   }>(),
   {
-    saveLabel: '저장',
+    saveLabel: '다운로드',
     showSave: true,
     showExportActions: false,
     showFilename: true,
@@ -163,10 +163,21 @@ defineEmits<{
 @media (max-width: 640px) {
   .toolbar {
     grid-template-columns: minmax(0, 1fr) auto;
+    min-height: 48px;
+    padding: 0.4rem 0.55rem;
   }
 
   .toolbar__title {
     display: none;
   }
+
+  .toolbar__link {
+    display: none;
+  }
+
+  .toolbar__btn {
+    min-height: 2.5rem;
+    padding: 0.4rem 0.75rem;
+  }
 }
 </style>

packages/frontend/src/components/FileTypeIcon.vue

@@ -1,7 +1,9 @@
 <script setup lang="ts">
 import { computed } from 'vue';
 import {
+  HWP_ICON_URL,
   ICON_COLORS,
+  ICON_MARK_PATHS,
   ICON_PATHS,
   iconKindForExtension,
 } from '@/config/favicons';
@@ -11,28 +13,65 @@ const props = withDefaults(
     extension: string;
     size?: number;
   }>(),
-  { size: 40 },
+  { size: 36 },
 );
 
 const kind = computed(() => iconKindForExtension(props.extension.toLowerCase()));
+const mark = computed(() => ICON_MARK_PATHS[kind.value]);
+const boxStyle = computed(() => ({
+  width: `${props.size}px`,
+  height: `${props.size}px`,
+}));
 </script>
 
 <template>
+  <span class="ft-icon" :style="boxStyle" aria-hidden="true">
+    <img
+      v-if="kind === 'hwp'"
+      class="ft-icon__img"
+      :src="HWP_ICON_URL"
+      alt=""
+      draggable="false"
+    />
     <svg
-    class="ft-icon"
+      v-else
+      class="ft-icon__svg"
       xmlns="http://www.w3.org/2000/svg"
       viewBox="0 0 24 24"
-    :width="size"
-    :height="size"
-    aria-hidden="true"
     >
       <path :fill="ICON_COLORS[kind]" :d="ICON_PATHS[kind]" />
+      <path
+        v-if="mark"
+        fill="#ffffff"
+        fill-rule="evenodd"
+        :d="mark"
+      />
     </svg>
+  </span>
 </template>
 
 <style scoped>
 .ft-icon {
   flex-shrink: 0;
+  display: inline-grid;
+  place-items: center;
+  box-sizing: border-box;
+  overflow: hidden;
+  border-radius: 4px;
+  line-height: 0;
+}
+
+.ft-icon__svg,
+.ft-icon__img {
   display: block;
+  width: 100%;
+  height: 100%;
+}
+
+/* Raster HWP logo is full-bleed; match SVG document inset (~3/24). */
+.ft-icon__img {
+  object-fit: contain;
+  padding: 12.5%;
+  box-sizing: border-box;
 }
 </style>

packages/frontend/src/components/imageedit/CropEditor.vue

@@ -0,0 +1,285 @@
+<script setup lang="ts">
+import { computed, onBeforeUnmount } from 'vue';
+import {
+  clampCrop,
+  type PixelRect,
+} from '@/integrations/imageedit/process';
+
+defineOptions({ name: 'CropEditor' });
+
+const props = defineProps<{
+  src: string;
+  crop: PixelRect;
+  imageWidth: number;
+  imageHeight: number;
+  aspect: number | null;
+}>();
+
+const emit = defineEmits<{
+  'update:crop': [PixelRect];
+}>();
+
+type Handle = 'move' | 'n' | 's' | 'e' | 'w' | 'ne' | 'nw' | 'se' | 'sw';
+
+const handles = computed<Handle[]>(() =>
+  props.aspect
+    ? ['nw', 'ne', 'se', 'sw']
+    : ['n', 's', 'e', 'w', 'ne', 'nw', 'se', 'sw'],
+);
+
+const boxStyle = computed(() => {
+  const w = props.imageWidth || 1;
+  const h = props.imageHeight || 1;
+  return {
+    left: `${(props.crop.x / w) * 100}%`,
+    top: `${(props.crop.y / h) * 100}%`,
+    width: `${(props.crop.width / w) * 100}%`,
+    height: `${(props.crop.height / h) * 100}%`,
+  };
+});
+
+let drag: {
+  handle: Handle;
+  pointerId: number;
+  startX: number;
+  startY: number;
+  start: PixelRect;
+  displayScale: number;
+} | null = null;
+
+function displayScaleFromEvent(event: PointerEvent) {
+  const stage = (event.currentTarget as HTMLElement).closest('.crop');
+  const img = stage?.querySelector('img');
+  if (!img || !props.imageWidth) return 1;
+  return img.clientWidth / props.imageWidth;
+}
+
+function bindWindow(on: boolean) {
+  if (on) {
+    window.addEventListener('pointermove', onPointerMove);
+    window.addEventListener('pointerup', endDrag);
+    window.addEventListener('pointercancel', endDrag);
+  } else {
+    window.removeEventListener('pointermove', onPointerMove);
+    window.removeEventListener('pointerup', endDrag);
+    window.removeEventListener('pointercancel', endDrag);
+  }
+}
+
+function beginDrag(handle: Handle, event: PointerEvent) {
+  event.preventDefault();
+  event.stopPropagation();
+  (event.currentTarget as HTMLElement).setPointerCapture(event.pointerId);
+  bindWindow(false);
+  drag = {
+    handle,
+    pointerId: event.pointerId,
+    startX: event.clientX,
+    startY: event.clientY,
+    start: { ...props.crop },
+    displayScale: displayScaleFromEvent(event),
+  };
+  bindWindow(true);
+}
+
+function applyAspectFromFixedCorner(
+  next: PixelRect,
+  fixed: { x: number; y: number },
+  preferWidth: boolean,
+) {
+  const aspect = props.aspect;
+  if (!aspect) return next;
+  if (preferWidth) {
+    next.height = next.width / aspect;
+  } else {
+    next.width = next.height * aspect;
+  }
+  next.x = fixed.x < next.x + next.width ? fixed.x : fixed.x - next.width;
+  next.y = fixed.y < next.y + next.height ? fixed.y : fixed.y - next.height;
+  if (next.width < 0) {
+    next.x += next.width;
+    next.width = Math.abs(next.width);
+  }
+  if (next.height < 0) {
+    next.y += next.height;
+    next.height = Math.abs(next.height);
+  }
+  return next;
+}
+
+function onPointerMove(event: PointerEvent) {
+  if (!drag || event.pointerId !== drag.pointerId) return;
+  const scale = drag.displayScale || 1;
+  const dx = (event.clientX - drag.startX) / scale;
+  const dy = (event.clientY - drag.startY) / scale;
+  const start = drag.start;
+  let next: PixelRect = { ...start };
+  const handle = drag.handle;
+  const aspect = props.aspect;
+
+  if (handle === 'move') {
+    next.x = start.x + dx;
+    next.y = start.y + dy;
+    emit(
+      'update:crop',
+      clampCrop(next, props.imageWidth, props.imageHeight),
+    );
+    return;
+  }
+
+  const se = { x: start.x + start.width, y: start.y + start.height };
+  const nw = { x: start.x, y: start.y };
+
+  if (handle.includes('e') || handle === 'e') next.width = start.width + dx;
+  if (handle.includes('s') || handle === 's') next.height = start.height + dy;
+  if (handle.includes('w') || handle === 'w') {
+    next.x = start.x + dx;
+    next.width = start.width - dx;
+  }
+  if (handle.includes('n') || handle === 'n') {
+    next.y = start.y + dy;
+    next.height = start.height - dy;
+  }
+
+  if (aspect) {
+    if (handle === 'se') {
+      next = applyAspectFromFixedCorner(next, nw, Math.abs(dx) >= Math.abs(dy));
+      next.x = nw.x;
+      next.y = nw.y;
+    } else if (handle === 'nw') {
+      next = applyAspectFromFixedCorner(next, se, Math.abs(dx) >= Math.abs(dy));
+      next.x = se.x - next.width;
+      next.y = se.y - next.height;
+    } else if (handle === 'ne') {
+      const fixed = { x: start.x, y: se.y };
+      next = applyAspectFromFixedCorner(next, fixed, Math.abs(dx) >= Math.abs(dy));
+      next.x = start.x;
+      next.y = se.y - next.height;
+    } else if (handle === 'sw') {
+      const fixed = { x: se.x, y: start.y };
+      next = applyAspectFromFixedCorner(next, fixed, Math.abs(dx) >= Math.abs(dy));
+      next.x = se.x - next.width;
+      next.y = start.y;
+    }
+  }
+
+  emit('update:crop', clampCrop(next, props.imageWidth, props.imageHeight));
+}
+
+function endDrag(event: PointerEvent) {
+  if (!drag || event.pointerId !== drag.pointerId) return;
+  drag = null;
+  bindWindow(false);
+}
+
+onBeforeUnmount(() => bindWindow(false));
+</script>
+
+<template>
+  <div class="crop">
+    <img :src="src" alt="편집할 이미지" draggable="false" />
+    <div class="crop__shade" aria-hidden="true" />
+    <div
+      class="crop__box"
+      :style="boxStyle"
+      @pointerdown="beginDrag('move', $event)"
+    >
+      <span
+        v-for="handle in handles"
+        :key="handle"
+        class="crop__handle"
+        :class="`crop__handle--${handle}`"
+        @pointerdown="beginDrag(handle, $event)"
+      />
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.crop {
+  position: relative;
+  display: inline-block;
+  max-width: 100%;
+  line-height: 0;
+  overflow: hidden;
+  touch-action: none;
+  user-select: none;
+}
+
+.crop img {
+  display: block;
+  max-width: 100%;
+  max-height: min(70vh, 44rem);
+  width: auto;
+  height: auto;
+}
+
+.crop__shade {
+  pointer-events: none;
+  position: absolute;
+  inset: 0;
+}
+
+.crop__box {
+  position: absolute;
+  box-sizing: border-box;
+  border: 2px solid var(--accent);
+  box-shadow: 0 0 0 9999px rgb(0 0 0 / 42%);
+  cursor: move;
+}
+
+.crop__handle {
+  position: absolute;
+  width: 0.8rem;
+  height: 0.8rem;
+  background: var(--surface);
+  border: 2px solid var(--accent);
+  border-radius: 1px;
+  box-sizing: border-box;
+}
+
+.crop__handle--nw {
+  left: -0.4rem;
+  top: -0.4rem;
+  cursor: nwse-resize;
+}
+.crop__handle--ne {
+  right: -0.4rem;
+  top: -0.4rem;
+  cursor: nesw-resize;
+}
+.crop__handle--se {
+  right: -0.4rem;
+  bottom: -0.4rem;
+  cursor: nwse-resize;
+}
+.crop__handle--sw {
+  left: -0.4rem;
+  bottom: -0.4rem;
+  cursor: nesw-resize;
+}
+.crop__handle--n {
+  left: 50%;
+  top: -0.4rem;
+  transform: translateX(-50%);
+  cursor: ns-resize;
+}
+.crop__handle--s {
+  left: 50%;
+  bottom: -0.4rem;
+  transform: translateX(-50%);
+  cursor: ns-resize;
+}
+.crop__handle--e {
+  right: -0.4rem;
+  top: 50%;
+  transform: translateY(-50%);
+  cursor: ew-resize;
+}
+.crop__handle--w {
+  left: -0.4rem;
+  top: 50%;
+  transform: translateY(-50%);
+  cursor: ew-resize;
+}
+</style>

packages/frontend/src/components/model3d/Model3DCanvas.vue

@@ -35,6 +35,11 @@ import {
   meshInstancePropertyGroups,
   modelPropertyGroups,
 } from '@/integrations/model3d/o3dv';
+import {
+  createPointCloudFromPly,
+  isNoFacesImportError,
+  isPlyFileName,
+} from '@/integrations/model3d/pointCloudPly';
 
 const props = defineProps<{
   files: readonly File[];
@@ -67,6 +72,8 @@ const host = ref<HTMLElement | null>(null);
 let viewer: OV.Viewer | null = null;
 let loader: OV.ThreeModelLoader | null = null;
 let model: OV.Model | null = null;
+let pointCloudMode = false;
+let pointCloudGroups: ModelPropertyGroup[] = [];
 let canvas: HTMLCanvasElement | null = null;
 let resizeObserver: ResizeObserver | null = null;
 let loadSequence = 0;
@@ -98,7 +105,7 @@ function applyEnvironment() {
 }
 
 function applyEdges(enabled: boolean) {
-  if (!viewer) return;
+  if (!viewer || pointCloudMode) return;
   viewer.SetEdgeSettings(
     new OV.EdgeSettings(enabled, new OV.RGBColor(0, 0, 0), 15),
   );
@@ -119,7 +126,7 @@ function applyUp(axis: 'y' | 'z') {
 }
 
 function fitCamera() {
-  if (!viewer || !model) return;
+  if (!viewer || (!model && !pointCloudMode)) return;
   const sphere = viewer.GetBoundingSphere(() => true);
   if (!sphere) return;
   viewer.AdjustClippingPlanesToSphere(sphere);
@@ -159,7 +166,7 @@ function addMeasureLine(a: Vector3, b: Vector3) {
 }
 
 function applyVisibility() {
-  if (!viewer) return;
+  if (!viewer || pointCloudMode) return;
   viewer.SetMeshesVisibility((userData: {
     originalMeshInstance?: OV.MeshInstance;
   }) => {
@@ -170,7 +177,7 @@ function applyVisibility() {
 }
 
 function applyHighlight() {
-  if (!viewer) return;
+  if (!viewer || pointCloudMode) return;
   viewer.SetMeshesHighlight(new OV.RGBColor(255, 200, 0), (userData: {
     originalMeshInstance?: OV.MeshInstance;
   }) => {
@@ -180,6 +187,10 @@ function applyHighlight() {
 }
 
 function selectByKey(key: string | null) {
+  if (pointCloudMode) {
+    emit('select', null, pointCloudGroups);
+    return;
+  }
   if (!model) {
     emit('select', null, []);
     return;
@@ -191,9 +202,10 @@ function selectByKey(key: string | null) {
 }
 
 function onMouseClick(_button: number, mouseCoords: { x: number; y: number }) {
-  if (!viewer || !model) return;
+  if (!viewer || (!model && !pointCloudMode)) return;
 
   if (props.measureMode) {
+    if (pointCloudMode) return;
     const hit = viewer.GetMeshIntersectionUnderMouse(
       OV.IntersectionMode.MeshOnly,
       mouseCoords,
@@ -224,6 +236,11 @@ function onMouseClick(_button: number, mouseCoords: { x: number; y: number }) {
     return;
   }
 
+  if (pointCloudMode) {
+    selectByKey(null);
+    return;
+  }
+
   const userData = viewer.GetMeshUserDataUnderMouse(
     OV.IntersectionMode.MeshOnly,
     mouseCoords,
@@ -232,11 +249,33 @@ function onMouseClick(_button: number, mouseCoords: { x: number; y: number }) {
   selectByKey(key);
 }
 
+async function loadPointCloudPly(file: File, sequence: number) {
+  emit('progress', 0.4, '포인트 클라우드 읽는 중');
+  const result = await createPointCloudFromPly(file);
+  if (sequence !== loadSequence || !viewer) return;
+  pointCloudMode = true;
+  pointCloudGroups = result.groups;
+  model = null;
+  viewer.Clear();
+  viewer.SetMainObject(result.object);
+  applyProjection(props.projection);
+  applyUp(props.upAxis);
+  void nextTick(() => {
+    if (sequence !== loadSequence) return;
+    fitCamera();
+    emit('progress', 1, '포인트 클라우드 준비 완료');
+    emit('loaded', result.stats, result.tree, result.groups, []);
+    selectByKey(null);
+  });
+}
+
 async function load(files: readonly File[]) {
   const sequence = ++loadSequence;
   if (!viewer || !loader) return;
   clearMeasure();
   model = null;
+  pointCloudMode = false;
+  pointCloudGroups = [];
   viewer.Clear();
   if (!files.length) return;
 
@@ -263,6 +302,8 @@ async function load(files: readonly File[]) {
     onTextureLoaded: () => viewer?.Render(),
     onModelFinished: (importResult: OV.ImportResult, threeObject: unknown) => {
       if (sequence !== loadSequence) return;
+      pointCloudMode = false;
+      pointCloudGroups = [];
       viewer?.SetMainObject(threeObject);
       model = importResult.model;
       applyVisibility();
@@ -272,6 +313,7 @@ async function load(files: readonly File[]) {
       applyUp(props.upAxis);
       void nextTick(() => {
         fitCamera();
+        emit('progress', 1, '모델 준비 완료');
         emit(
           'loaded',
           summarizeModel(importResult.model),
@@ -279,13 +321,26 @@ async function load(files: readonly File[]) {
           modelPropertyGroups(importResult.model),
           importResult.missingFiles ?? [],
         );
-        emit('progress', 1, '모델 준비 완료');
         selectByKey(null);
       });
     },
     onLoadError: (importError: OV.ImportError) => {
       if (sequence !== loadSequence) return;
-      emit('error', importErrorMessage(importError));
+      const message = importErrorMessage(importError);
+      const ply = files.find((file) => isPlyFileName(file.name));
+      if (ply && isNoFacesImportError(message)) {
+        void loadPointCloudPly(ply, sequence).catch((reason) => {
+          if (sequence !== loadSequence) return;
+          emit(
+            'error',
+            reason instanceof Error
+              ? reason.message
+              : '포인트 클라우드 PLY를 열지 못했습니다.',
+          );
+        });
+        return;
+      }
+      emit('error', message);
     },
   });
 }

packages/frontend/src/components/scanner/CornerEditor.vue

@@ -12,10 +12,24 @@ const emit = defineEmits<{
   'update:corners': [value: CornerPoints];
 }>();
 
+const LOUPE_SIZE = 128;
+const LOUPE_ZOOM = 2.8;
+
+/** 드래그 중인 코너 반대편에 루페를 두어 손가락에 가리지 않게 함 */
+const LOUPE_CORNER: Record<
+  keyof CornerPoints,
+  { x: 'left' | 'right'; y: 'top' | 'bottom' }
+> = {
+  topLeftCorner: { x: 'right', y: 'bottom' },
+  topRightCorner: { x: 'left', y: 'bottom' },
+  bottomRightCorner: { x: 'left', y: 'top' },
+  bottomLeftCorner: { x: 'right', y: 'top' },
+};
+
 const host = ref<HTMLElement | null>(null);
 const imageEl = ref<HTMLImageElement | null>(null);
 const display = ref({ width: 0, height: 0, naturalWidth: 1, naturalHeight: 1 });
-let dragging: keyof CornerPoints | null = null;
+const dragging = ref<keyof CornerPoints | null>(null);
 
 const scaleX = computed(
   () => display.value.width / Math.max(1, display.value.naturalWidth),
@@ -50,6 +64,30 @@ const polygonPoints = computed(() => {
     .join(' ');
 });
 
+const loupeStyle = computed(() => {
+  const key = dragging.value;
+  if (!key || display.value.width < 8) return null;
+
+  const point = props.corners[key];
+  const anchor = LOUPE_CORNER[key];
+  const margin = 10;
+  const left =
+    anchor.x === 'left' ? margin : display.value.width - LOUPE_SIZE - margin;
+  const top =
+    anchor.y === 'top' ? margin : display.value.height - LOUPE_SIZE - margin;
+
+  return {
+    width: `${LOUPE_SIZE}px`,
+    height: `${LOUPE_SIZE}px`,
+    left: `${left}px`,
+    top: `${top}px`,
+    backgroundImage: `url(${props.imageUrl})`,
+    backgroundRepeat: 'no-repeat',
+    backgroundSize: `${display.value.naturalWidth * LOUPE_ZOOM}px ${display.value.naturalHeight * LOUPE_ZOOM}px`,
+    backgroundPosition: `${LOUPE_SIZE / 2 - point.x * LOUPE_ZOOM}px ${LOUPE_SIZE / 2 - point.y * LOUPE_ZOOM}px`,
+  };
+});
+
 function measure() {
   if (!host.value || !imageEl.value) return;
   const rect = imageEl.value.getBoundingClientRect();
@@ -70,13 +108,13 @@ function clamp(point: Point2D): Point2D {
 
 function onPointerDown(key: keyof CornerPoints, event: PointerEvent) {
   if (props.disabled) return;
-  dragging = key;
+  dragging.value = key;
   (event.target as HTMLElement).setPointerCapture?.(event.pointerId);
   event.preventDefault();
 }
 
 function onPointerMove(event: PointerEvent) {
-  if (!dragging || !imageEl.value) return;
+  if (!dragging.value || !imageEl.value) return;
   const rect = imageEl.value.getBoundingClientRect();
   const nextPoint = clamp({
     x: (event.clientX - rect.left) / scaleX.value,
@@ -84,12 +122,12 @@ function onPointerMove(event: PointerEvent) {
   });
   emit('update:corners', {
     ...props.corners,
-    [dragging]: nextPoint,
+    [dragging.value]: nextPoint,
   });
 }
 
 function onPointerUp() {
-  dragging = null;
+  dragging.value = null;
 }
 
 onMounted(() => {
@@ -132,11 +170,20 @@ watch(
       :key="handle.key"
       type="button"
       class="corner-editor__handle"
+      :class="{ 'is-active': dragging === handle.key }"
       :style="{ left: `${handle.left}px`, top: `${handle.top}px` }"
       :disabled="disabled"
       :aria-label="handle.key"
       @pointerdown="onPointerDown(handle.key, $event)"
     />
+    <div
+      v-if="loupeStyle"
+      class="corner-editor__loupe"
+      :style="loupeStyle"
+      aria-hidden="true"
+    >
+      <span class="corner-editor__loupe-cross" />
+    </div>
   </div>
 </template>
 
@@ -185,7 +232,8 @@ watch(
   touch-action: none;
 }
 
-.corner-editor__handle:active {
+.corner-editor__handle.is-active {
+  transform: scale(1.15);
   cursor: grabbing;
 }
 
@@ -193,4 +241,60 @@ watch(
   opacity: 0.5;
   cursor: default;
 }
+
+.corner-editor__loupe {
+  position: absolute;
+  z-index: 3;
+  box-sizing: border-box;
+  border: 2px solid white;
+  border-radius: 50%;
+  box-shadow:
+    0 0 0 1px color-mix(in srgb, black 35%, transparent),
+    0 10px 28px color-mix(in srgb, black 28%, transparent);
+  pointer-events: none;
+  overflow: hidden;
+  background-color: color-mix(in srgb, var(--bg, #111) 80%, black);
+}
+
+.corner-editor__loupe-cross {
+  position: absolute;
+  inset: 0;
+  pointer-events: none;
+}
+
+.corner-editor__loupe-cross::before,
+.corner-editor__loupe-cross::after {
+  content: '';
+  position: absolute;
+  background: color-mix(in srgb, white 88%, transparent);
+  box-shadow: 0 0 0 0.5px color-mix(in srgb, black 40%, transparent);
+}
+
+.corner-editor__loupe-cross::before {
+  left: 50%;
+  top: 18%;
+  bottom: 18%;
+  width: 1.5px;
+  transform: translateX(-50%);
+}
+
+.corner-editor__loupe-cross::after {
+  top: 50%;
+  left: 18%;
+  right: 18%;
+  height: 1.5px;
+  transform: translateY(-50%);
+}
+
+@media (max-width: 900px) {
+  .corner-editor__image {
+    max-height: min(52vh, 520px);
+  }
+
+  .corner-editor__handle {
+    width: 28px;
+    height: 28px;
+    margin: -14px 0 0 -14px;
+  }
+}
 </style>

packages/frontend/src/composables/imageEditSession.ts

@@ -0,0 +1,11 @@
+let pending: File | null = null;
+
+export function stageImageEditFile(file: File) {
+  pending = file;
+}
+
+export function consumeImageEditFile(): File | null {
+  const file = pending;
+  pending = null;
+  return file;
+}

packages/frontend/src/composables/useFileDropZone.ts

@@ -0,0 +1,41 @@
+import { ref } from 'vue';
+
+/** Nested dragenter/leave safe file drop handlers for a page root. */
+export function useFileDropZone(onFiles: (files: File[]) => void) {
+  const dropActive = ref(false);
+  let depth = 0;
+
+  function onDragEnter(event: DragEvent) {
+    event.preventDefault();
+    depth += 1;
+    dropActive.value = true;
+    if (event.dataTransfer) event.dataTransfer.dropEffect = 'copy';
+  }
+
+  function onDragOver(event: DragEvent) {
+    event.preventDefault();
+    if (event.dataTransfer) event.dataTransfer.dropEffect = 'copy';
+  }
+
+  function onDragLeave(event: DragEvent) {
+    event.preventDefault();
+    depth = Math.max(0, depth - 1);
+    if (depth === 0) dropActive.value = false;
+  }
+
+  function onDrop(event: DragEvent) {
+    event.preventDefault();
+    depth = 0;
+    dropActive.value = false;
+    const files = Array.from(event.dataTransfer?.files ?? []);
+    if (files.length) onFiles(files);
+  }
+
+  return {
+    dropActive,
+    onDragEnter,
+    onDragOver,
+    onDragLeave,
+    onDrop,
+  };
+}

packages/frontend/src/composables/useOpenDocument.ts

@@ -19,6 +19,7 @@ import {
   storeHwpFile,
 } from '@/composables/useSessionLifecycle';
 import { stageDiagramFile } from '@/composables/diagramSession';
+import { stageImageEditFile } from '@/composables/imageEditSession';
 import { stageScannerFiles } from '@/composables/scannerSession';
 import { stageViewerFiles } from '@/composables/viewerSession';
 
@@ -63,6 +64,11 @@ export function useOpenDocument() {
         await router.push({ name: 'tools-scanner' });
         return true;
       }
+      if (toolKind === 'imageedit') {
+        stageImageEditFile(file);
+        await router.push({ name: 'tools-image-edit' });
+        return true;
+      }
 
       const diagramKind = diagramKindFor(file.name);
       if (diagramKind) {

packages/frontend/src/composables/usePageTitle.ts

@@ -6,27 +6,44 @@ import {
   type MaybeRefOrGetter,
 } from 'vue';
 import { APP_DISPLAY_NAME } from '@/config/app';
-import { faviconHrefFor, setFavicon } from '@/config/favicons';
+import {
+  faviconHrefFor,
+  faviconHrefForKind,
+  setFavicon,
+  type FaviconKind,
+} from '@/config/favicons';
 
 export function formatPageTitle(filename?: string | null): string {
   const name = filename?.trim();
   return name ? `${name} - ${APP_DISPLAY_NAME}` : APP_DISPLAY_NAME;
 }
 
+export type UsePageTitleOptions = {
+  /** Force favicon kind (tools whose file extensions collide with other tools). */
+  faviconKind?: MaybeRefOrGetter<FaviconKind | null | undefined>;
+};
+
 /**
  * Sets `document.title` to `filename - Sejong Office` (or just the app name)
  * and swaps the favicon by file extension (home icon when no file).
+ * Pass `faviconKind` when the route should keep a fixed tool/viewer icon.
  */
 export function usePageTitle(
   filename: MaybeRefOrGetter<string | null | undefined> = null,
+  options?: UsePageTitleOptions,
 ) {
   function apply() {
     const name = toValue(filename);
     document.title = formatPageTitle(name);
-    setFavicon(faviconHrefFor(name));
+    const kind = options?.faviconKind != null ? toValue(options.faviconKind) : null;
+    setFavicon(kind ? faviconHrefForKind(kind) : faviconHrefFor(name));
   }
 
-  watch(() => toValue(filename), apply, { immediate: true });
+  watch(
+    () => [toValue(filename), toValue(options?.faviconKind)] as const,
+    apply,
+    { immediate: true },
+  );
   onMounted(apply);
   onActivated(apply);
 }

packages/frontend/src/composables/useSessionLifecycle.ts

@@ -2,6 +2,7 @@ import { onMounted, onUnmounted } from 'vue';
 import { createSession, endSession, heartbeat } from '@/api/client';
 
 const HWP_FILE_KEY = 'sejong_hwp_file';
+const HWP_OPEN_TOKEN_KEY = 'sejong_hwp_open_token';
 
 let pageHideBound = false;
 
@@ -31,6 +32,16 @@ export function storeHwpFile(file: File): Promise<void> {
   });
 }
 
+/** Bumps whenever a HWP/HWPX is staged for the editor (forces a fresh view). */
+export function hwpOpenToken(): string {
+  if (typeof sessionStorage === 'undefined') return '0';
+  return sessionStorage.getItem(HWP_OPEN_TOKEN_KEY) ?? '0';
+}
+
+function bumpHwpOpenToken(): void {
+  sessionStorage.setItem(HWP_OPEN_TOKEN_KEY, `${Date.now()}`);
+}
+
 export function storeHwpBuffer(name: string, buffer: ArrayBuffer): void {
   const bytes = new Uint8Array(buffer);
   let binary = '';
@@ -45,6 +56,7 @@ export function storeHwpBuffer(name: string, buffer: ArrayBuffer): void {
       base64: btoa(binary),
     }),
   );
+  bumpHwpOpenToken();
 }
 
 export function loadHwpFile(): { name: string; buffer: ArrayBuffer } | null {
@@ -68,6 +80,7 @@ export function loadHwpFile(): { name: string; buffer: ArrayBuffer } | null {
 
 export function clearHwpFile(): void {
   sessionStorage.removeItem(HWP_FILE_KEY);
+  sessionStorage.removeItem(HWP_OPEN_TOKEN_KEY);
 }
 
 export function useSessionLifecycle(options?: { enableHeartbeat?: boolean }) {

packages/frontend/src/config/app.ts

@@ -6,8 +6,8 @@ export const APP_NAME = "sejong-office";
 export const APP_DISPLAY_NAME = "Sejong Office";
 
 export type DiagramKind = "excalidraw" | "mermaid" | "drawio";
-export type ViewerKind = "cad" | "model3d";
+export type ViewerKind = "cad" | "model3d" | "illustrator" | "photoshop" | "markdown";
-export type ToolKind = "scanner";
+export type ToolKind = "scanner" | "imageedit";
 
 const DIAGRAM_EXTENSION_KIND: Record<string, DiagramKind> = {
   excalidraw: "excalidraw",
@@ -34,6 +34,7 @@ const TOOL_EXTENSION_KIND: Record<string, ToolKind> = {
   webp: "scanner",
   gif: "scanner",
   bmp: "scanner",
+  ico: "imageedit",
 };
 
 /** Online3DViewer import formats (+ zip container). */
@@ -66,6 +67,11 @@ export const MODEL3D_EXTENSIONS = [
 const VIEWER_EXTENSION_KIND: Record<string, ViewerKind> = {
   dxf: "cad",
   dwg: "cad",
+  ai: "illustrator",
+  psd: "photoshop",
+  md: "markdown",
+  markdown: "markdown",
+  mdown: "markdown",
   ...Object.fromEntries(
     MODEL3D_EXTENSIONS.map((ext) => [ext, "model3d" as const]),
   ),

packages/frontend/src/config/favicons.ts

@@ -4,6 +4,7 @@
  */
 
 import { extensionOf } from '@/config/app';
+import hwpIconUrl from '@/assets/icons/hwp.png';
 
 export type FaviconKind =
   | 'home'
@@ -17,44 +18,89 @@ export type FaviconKind =
   | 'diagram'
   | 'cad'
   | 'model3d'
+  | 'illustrator'
+  | 'photoshop'
   | 'scanner'
+  | 'bgremove'
+  | 'imgedit'
+  | 'markdown'
   | 'text'
   | 'csv'
   | 'file';
 
+/** Shared filled document plate for letter-mark office icons. */
+export const DOC_SHELL_PATH =
+  'M19,3H5C3.89,3 3,3.89 3,5V19A2,2 0 0,0 5,21H19A2,2 0 0,0 21,19V5C21,3.89 20.1,3 19,3Z';
+
 export const ICON_PATHS: Record<FaviconKind, string> = {
   home: 'M9,13H15V19H18V10L12,5.5L6,10V19H9V13M4,21V9L12,3L20,9V21H4Z',
-  pdf: 'M19 3H5C3.9 3 3 3.9 3 5V19C3 20.1 3.9 21 5 21H19C20.1 21 21 20.1 21 19V5C21 3.9 20.1 3 19 3M9.5 11.5C9.5 12.3 8.8 13 8 13H7V15H5.5V9H8C8.8 9 9.5 9.7 9.5 10.5V11.5M14.5 13.5C14.5 14.3 13.8 15 13 15H10.5V9H13C13.8 9 14.5 9.7 14.5 10.5V13.5M18.5 10.5H17V11.5H18.5V13H17V15H15.5V9H18.5V10.5M12 10.5H13V13.5H12V10.5M7 10.5H8V11.5H7V10.5Z',
+  pdf: DOC_SHELL_PATH,
-  word: 'M15.5,17H14L12,9.5L10,17H8.5L6.1,7H7.8L9.34,14.5L11.3,7H12.7L14.67,14.5L16.2,7H17.9M19,3H5C3.89,3 3,3.89 3,5V19A2,2 0 0,0 5,21H19A2,2 0 0,0 21,19V5C21,3.89 20.1,3 19,3Z',
+  word: DOC_SHELL_PATH,
-  excel:
+  excel: DOC_SHELL_PATH,
-    'M16.2,17H14.2L12,13.2L9.8,17H7.8L11,12L7.8,7H9.8L12,10.8L14.2,7H16.2L13,12M19,3H5C3.89,3 3,3.89 3,5V19A2,2 0 0,0 5,21H19A2,2 0 0,0 21,19V5C21,3.89 20.1,3 19,3Z',
+  powerpoint: DOC_SHELL_PATH,
-  powerpoint:
+  hwp: DOC_SHELL_PATH,
-    'M9.8,13.4H12.3C13.8,13.4 14.46,13.12 15.1,12.58C15.74,12.03 16,11.25 16,10.23C16,9.26 15.75,8.5 15.1,7.88C14.45,7.29 13.83,7 12.3,7H8V17H9.8V13.4M19,3A2,2 0 0,1 21,5V19A2,2 0 0,1 19,21H5A2,2 0 0,1 3,19V5C3,3.89 3.9,3 5,3H19M9.8,12V8.4H12.1C12.76,8.4 13.27,8.65 13.6,9C13.93,9.35 14.1,9.72 14.1,10.24C14.1,10.8 13.92,11.19 13.6,11.5C13.28,11.81 12.9,12 12.22,12H9.8Z',
-  hwp: 'M17,4V10L15,8L13,10V4H9V20H19V4H17M3,7V5H5V4C5,2.89 5.9,2 7,2H19C20.05,2 21,2.95 21,4V20C21,21.05 20.05,22 19,22H7C5.95,22 5,21.05 5,20V19H3V17H5V13H3V11H5V7H3M5,5V7H7V5H5M5,19H7V17H5V19M5,13H7V11H5V13Z',
   sketch: 'M3 17.25V21H6.75L17.81 9.94L14.06 6.19L3 17.25M20.71 7.04C21.1 6.65 21.1 6 20.71 5.63L18.37 3.29C18 2.9 17.35 2.9 16.96 3.29L15.13 5.12L18.88 8.87L20.71 7.04Z',
   code: 'M8 3L6.59 4.41L10.17 8L6.59 11.59L8 13L13 8L8 3M14 11V13H22V11H14M5 19H19V17H5V19Z',
   diagram: 'M4 3H10V9H8V11H16V9H14V3H20V9H18V13H13V15H16V21H8V15H11V13H6V9H4V3M6 5V7H8V5H6M16 5V7H18V5H16M10 17V19H14V17H10Z',
   cad: 'M3 3H21V21H3V3M5 5V19H19V5H5M7 17V15H9V13H11V11H13V9H15V7H17V17H7Z',
   model3d: 'M12 2L21 7V17L12 22L3 17V7L12 2M12 4.3L5.4 8L12 11.7L18.6 8L12 4.3M5 9.7V15.8L11 19.1V13.1L5 9.7M13 19.1L19 15.8V9.7L13 13.1V19.1Z',
+  /** mdi:vector-polyline — Illustrator-style mark */
+  illustrator:
+    'M2,9V15H6.5L9.5,19H14.5L17.5,15H22V9H17.5L14.5,5H9.5L6.5,9H2M9.5,7.5L12,11L14.5,7.5H9.5M6.5,10.5L8.5,13.5H5V10.5H6.5M18.5,13.5L16.5,10.5H19V13.5H18.5M12,12.5L9.5,16.5H14.5L12,12.5Z',
+  /** mdi:image — Photoshop-style mark */
+  photoshop:
+    'M19,19H5V5H19M19,3H5A2,2 0 0,0 3,5V19A2,2 0 0,0 5,21H19A2,2 0 0,0 21,19V5A2,2 0 0,0 19,3M13.96,12.29L11.21,15.83L9.25,13.47L6.5,17H17.5L13.96,12.29Z',
   scanner: 'M4 4H10V6H6V10H4V4M14 4H20V10H18V6H14V4M4 14H6V18H10V20H4V14M18 14H20V20H14V18H18V14M8 8H16V16H8V8Z',
+  bgremove:
+    'M19.36,2.72L20.78,4.14L15.06,9.85C16.13,11.39 16.28,13.24 15.38,14.44L9.06,8.12C10.26,7.22 12.11,7.37 13.65,8.44L19.36,2.72M5.93,17.57C3.92,15.56 2.69,13.16 2.35,10.92L7.23,8.83L14.67,16.27L12.58,21.15C10.34,20.81 7.94,19.58 5.93,17.57Z',
+  /** mdi:crop */
+  imgedit:
+    'M7,17V1H5V5H1V7H5V17A2,2 0 0,0 7,19H17V23H19V19H23V17H19V7H7V17M17,17H7V7H17V17Z',
+  /** mdi:language-markdown */
+  markdown:
+    'M20.56 18H3.44C2.65 18 2 17.37 2 16.59V7.41C2 6.63 2.65 6 3.44 6H20.56C21.35 6 22 6.63 22 7.41V16.59C22 17.37 21.35 18 20.56 18M6.81 15.19V11.53L8.73 13.88L10.66 11.53V15.19H12.31V8.81H10.66L8.73 11.16L6.81 8.81H5.16V15.19H6.81M15.19 15.19H19.5V13.84H16.84V12.5H19.5V11.16H16.84V9.81H19.5V8.81H15.19V15.19Z',
   text: 'M6,2A2,2 0 0,0 4,4V20A2,2 0 0,0 6,22H18A2,2 0 0,0 20,20V8L14,2H6M6,4H13V9H18V20H6V4M8,12V14H16V12H8M8,16V18H13V16H8Z',
   csv: 'M14 2H6C4.9 2 4 2.9 4 4V20C4 21.1 4.9 22 6 22H18C19.1 22 20 21.1 20 20V8L14 2M18 20H6V4H13V9H18V20M10 19L12 15H9V10H15V15L13 19H10',
   file: 'M6,2A2,2 0 0,0 4,4V20A2,2 0 0,0 6,22H18A2,2 0 0,0 20,20V8L14,2H6M6,4H13V9H18V20H6V4M8,12V14H16V12H8M8,16V18H13V16H8Z',
 };
 
+/**
+ * White glyphs drawn on `DOC_SHELL_PATH` (evenodd for letter counters).
+ * Paths adapted from Material Design Icons (@mdi/svg), Apache-2.0.
+ */
+export const ICON_MARK_PATHS: Partial<Record<FaviconKind, string>> = {
+  pdf:
+    'M9.5,11.5C9.5,12.3 8.8,13 8,13H7V15H5.5V9H8C8.8,9 9.5,9.7 9.5,10.5V11.5M7,10.5H8V11.5H7V10.5Z' +
+    'M14.5,13.5C14.5,14.3 13.8,15 13,15H10.5V9H13C13.8,9 14.5,9.7 14.5,10.5V13.5M12,10.5H13V13.5H12V10.5Z' +
+    'M18.5,10.5H17V11.5H18.5V13H17V15H15.5V9H18.5V10.5Z',
+  word: 'M15.5,17H14L12,9.5L10,17H8.5L6.1,7H7.8L9.34,14.5L11.3,7H12.7L14.67,14.5L16.2,7H17.9Z',
+  excel:
+    'M16.2,17H14.2L12,13.2L9.8,17H7.8L11,12L7.8,7H9.8L12,10.8L14.2,7H16.2L13,12Z',
+  powerpoint:
+    'M9.8,13.4H12.3C13.8,13.4 14.46,13.12 15.1,12.58C15.74,12.03 16,11.25 16,10.23C16,9.26 15.75,8.5 15.1,7.88C14.45,7.29 13.83,7 12.3,7H8V17H9.8V13.4M9.8,12V8.4H12.1C12.76,8.4 13.27,8.65 13.6,9C13.93,9.35 14.1,9.72 14.1,10.24C14.1,10.8 13.92,11.19 13.6,11.5C13.28,11.81 12.9,12 12.22,12H9.8Z',
+};
+
+/** Raster logo for Hangul (HWP) documents. */
+export const HWP_ICON_URL = hwpIconUrl;
+
 export const ICON_COLORS: Record<FaviconKind, string> = {
   home: '#0f6cbd',
   pdf: '#e53935',
   word: '#1e88e5',
   excel: '#43a047',
   powerpoint: '#fb8c00',
-  hwp: '#00897b',
+  hwp: '#34aee7',
   sketch: '#7b61a8',
   code: '#d97706',
   diagram: '#2e7d8a',
   cad: '#5c6bc0',
   model3d: '#6d4c41',
+  illustrator: '#f57c00',
+  photoshop: '#31a8ff',
   scanner: '#00897b',
+  bgremove: '#5c6bc0',
+  imgedit: '#c2185b',
+  markdown: '#6f42c1',
   text: '#607d8b',
   csv: '#00838f',
   file: '#546e7a',
@@ -85,6 +131,8 @@ const EXT_KIND: Record<string, FaviconKind> = {
   xml: 'diagram',
   dxf: 'cad',
   dwg: 'cad',
+  ai: 'illustrator',
+  psd: 'photoshop',
   '3dm': 'model3d',
   '3ds': 'model3d',
   '3mf': 'model3d',
@@ -114,11 +162,29 @@ const EXT_KIND: Record<string, FaviconKind> = {
   webp: 'scanner',
   gif: 'scanner',
   bmp: 'scanner',
+  bgremove: 'bgremove',
+  imgedit: 'imgedit',
+  ico: 'imgedit',
+  md: 'markdown',
+  markdown: 'markdown',
+  mdown: 'markdown',
   txt: 'text',
 };
 
+export function iconSvgInner(kind: FaviconKind): string {
+  const color = ICON_COLORS[kind];
+  const mark = ICON_MARK_PATHS[kind];
+  if (mark) {
+    return (
+      `<path fill="${color}" d="${ICON_PATHS[kind]}"/>` +
+      `<path fill="#ffffff" fill-rule="evenodd" d="${mark}"/>`
+    );
+  }
+  return `<path fill="${color}" d="${ICON_PATHS[kind]}"/>`;
+}
+
 function toDataUri(kind: FaviconKind): string {
-  const svg = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path fill="${ICON_COLORS[kind]}" d="${ICON_PATHS[kind]}"/></svg>`;
+  const svg = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">${iconSvgInner(kind)}</svg>`;
   return `data:image/svg+xml,${encodeURIComponent(svg)}`;
 }
 
@@ -128,6 +194,16 @@ export function iconKindForExtension(ext: string): FaviconKind {
   return EXT_KIND[ext] ?? 'file';
 }
 
+export function faviconHrefForKind(kind: FaviconKind): string {
+  if (kind === 'hwp') return HWP_ICON_URL;
+  let href = CACHE.get(kind);
+  if (!href) {
+    href = toDataUri(kind);
+    CACHE.set(kind, href);
+  }
+  return href;
+}
+
 export function faviconHrefFor(filename?: string | null): string {
   const name = filename?.trim();
   let kind: FaviconKind = 'home';
@@ -135,12 +211,7 @@ export function faviconHrefFor(filename?: string | null): string {
     const ext = extensionOf(name);
     kind = ext ? (EXT_KIND[ext] ?? 'file') : 'home';
   }
-  let href = CACHE.get(kind);
+  return faviconHrefForKind(kind);
-  if (!href) {
-    href = toDataUri(kind);
-    CACHE.set(kind, href);
-  }
-  return href;
 }
 
 export function setFavicon(href: string) {
@@ -150,7 +221,10 @@ export function setFavicon(href: string) {
     link.rel = 'icon';
     document.head.appendChild(link);
   }
-  link.type = 'image/svg+xml';
+  link.type =
+    /\.png(?:\?|$)/i.test(href) || href.startsWith('data:image/png')
+      ? 'image/png'
+      : 'image/svg+xml';
   // Bust stubborn tab caches when switching between data URIs
   if (link.href !== href) {
     link.href = href;

packages/frontend/src/integrations/bgremove/removeBg.ts

@@ -0,0 +1,254 @@
+export type BgRemoveMode = 'threshold' | 'flood';
+
+export interface BgRemoveOptions {
+  /** 0–100: how far from sampled background still counts as background */
+  tolerance: number;
+  /** 0–100: soft edge width beyond hard threshold */
+  feather: number;
+  mode: BgRemoveMode;
+}
+
+export interface Rgb {
+  r: number;
+  g: number;
+  b: number;
+}
+
+export const DEFAULT_BG_REMOVE_OPTIONS: BgRemoveOptions = {
+  tolerance: 28,
+  feather: 12,
+  mode: 'threshold',
+};
+
+function clampByte(value: number) {
+  return Math.min(255, Math.max(0, Math.round(value)));
+}
+
+function colorDistance(a: Rgb, r: number, g: number, b: number) {
+  return Math.max(Math.abs(r - a.r), Math.abs(g - a.g), Math.abs(b - a.b));
+}
+
+function median(values: number[]) {
+  if (!values.length) return 0;
+  const sorted = [...values].sort((a, b) => a - b);
+  const mid = Math.floor(sorted.length / 2);
+  return sorted.length % 2
+    ? sorted[mid]!
+    : Math.round((sorted[mid - 1]! + sorted[mid]!) / 2);
+}
+
+/** Sample corner neighborhoods and take per-channel median as background. */
+export function sampleCornerBackground(
+  data: Uint8ClampedArray,
+  width: number,
+  height: number,
+  radius = 2,
+): Rgb {
+  const rs: number[] = [];
+  const gs: number[] = [];
+  const bs: number[] = [];
+  const corners: Array<[number, number]> = [
+    [0, 0],
+    [width - 1, 0],
+    [0, height - 1],
+    [width - 1, height - 1],
+  ];
+
+  for (const [cx, cy] of corners) {
+    for (let dy = -radius; dy <= radius; dy += 1) {
+      for (let dx = -radius; dx <= radius; dx += 1) {
+        const x = Math.min(width - 1, Math.max(0, cx + dx));
+        const y = Math.min(height - 1, Math.max(0, cy + dy));
+        const i = (y * width + x) * 4;
+        rs.push(data[i]!);
+        gs.push(data[i + 1]!);
+        bs.push(data[i + 2]!);
+      }
+    }
+  }
+
+  return { r: median(rs), g: median(gs), b: median(bs) };
+}
+
+function hardLimit(tolerance: number) {
+  return Math.round((Math.min(100, Math.max(0, tolerance)) / 100) * 180);
+}
+
+function featherWidth(feather: number) {
+  return Math.round((Math.min(100, Math.max(0, feather)) / 100) * 80);
+}
+
+function alphaForDistance(
+  distance: number,
+  hard: number,
+  soft: number,
+  originalAlpha: number,
+) {
+  if (distance <= hard) return 0;
+  if (soft <= 0 || distance >= hard + soft) return originalAlpha;
+  const t = (distance - hard) / soft;
+  return clampByte(originalAlpha * t);
+}
+
+function loadImage(source: string | Blob | HTMLImageElement | HTMLCanvasElement) {
+  if (source instanceof HTMLCanvasElement) {
+    return Promise.resolve(source);
+  }
+  if (source instanceof HTMLImageElement) {
+    if (source.complete && source.naturalWidth) return Promise.resolve(source);
+    return new Promise<HTMLImageElement>((resolve, reject) => {
+      source.onload = () => resolve(source);
+      source.onerror = () =>
+        reject(new Error('이미지를 불러오지 못했습니다.'));
+    });
+  }
+
+  const objectUrl =
+    typeof source === 'string' ? null : URL.createObjectURL(source);
+  const src = typeof source === 'string' ? source : objectUrl!;
+  return new Promise<HTMLImageElement>((resolve, reject) => {
+    const image = new Image();
+    image.onload = () => {
+      if (objectUrl) URL.revokeObjectURL(objectUrl);
+      resolve(image);
+    };
+    image.onerror = () => {
+      if (objectUrl) URL.revokeObjectURL(objectUrl);
+      reject(new Error('이미지를 불러오지 못했습니다.'));
+    };
+    image.src = src;
+  });
+}
+
+function drawToCanvas(
+  image: HTMLImageElement | HTMLCanvasElement,
+): HTMLCanvasElement {
+  if (image instanceof HTMLCanvasElement) {
+    const copy = document.createElement('canvas');
+    copy.width = image.width;
+    copy.height = image.height;
+    const ctx = copy.getContext('2d', { willReadFrequently: true });
+    if (!ctx) throw new Error('Canvas를 초기화하지 못했습니다.');
+    ctx.drawImage(image, 0, 0);
+    return copy;
+  }
+  const canvas = document.createElement('canvas');
+  canvas.width = image.naturalWidth || image.width;
+  canvas.height = image.naturalHeight || image.height;
+  const ctx = canvas.getContext('2d', { willReadFrequently: true });
+  if (!ctx) throw new Error('Canvas를 초기화하지 못했습니다.');
+  ctx.drawImage(image, 0, 0);
+  return canvas;
+}
+
+function applyThreshold(
+  data: Uint8ClampedArray,
+  bg: Rgb,
+  hard: number,
+  soft: number,
+) {
+  for (let i = 0; i < data.length; i += 4) {
+    const d = colorDistance(bg, data[i]!, data[i + 1]!, data[i + 2]!);
+    data[i + 3] = alphaForDistance(d, hard, soft, data[i + 3]!);
+  }
+}
+
+function applyFlood(
+  data: Uint8ClampedArray,
+  width: number,
+  height: number,
+  bg: Rgb,
+  hard: number,
+  soft: number,
+) {
+  const total = width * height;
+  const match = new Uint8Array(total);
+  const limit = hard + soft;
+  for (let p = 0; p < total; p += 1) {
+    const i = p * 4;
+    const d = colorDistance(bg, data[i]!, data[i + 1]!, data[i + 2]!);
+    if (d <= limit) match[p] = 1;
+  }
+
+  const visited = new Uint8Array(total);
+  const queue = new Int32Array(total);
+  let head = 0;
+  let tail = 0;
+
+  const seed = (x: number, y: number) => {
+    const p = y * width + x;
+    if (!match[p] || visited[p]) return;
+    visited[p] = 1;
+    queue[tail++] = p;
+  };
+
+  seed(0, 0);
+  seed(width - 1, 0);
+  seed(0, height - 1);
+  seed(width - 1, height - 1);
+
+  while (head < tail) {
+    const p = queue[head++]!;
+    const x = p % width;
+    const y = (p / width) | 0;
+    if (x > 0) seed(x - 1, y);
+    if (x + 1 < width) seed(x + 1, y);
+    if (y > 0) seed(x, y - 1);
+    if (y + 1 < height) seed(x, y + 1);
+  }
+
+  for (let p = 0; p < total; p += 1) {
+    if (!visited[p]) continue;
+    const i = p * 4;
+    const d = colorDistance(bg, data[i]!, data[i + 1]!, data[i + 2]!);
+    data[i + 3] = alphaForDistance(d, hard, soft, data[i + 3]!);
+  }
+}
+
+export async function removeBackgroundBySample(
+  source: string | Blob | HTMLImageElement | HTMLCanvasElement,
+  options: Partial<BgRemoveOptions> = {},
+): Promise<{
+  blob: Blob;
+  url: string;
+  width: number;
+  height: number;
+  background: Rgb;
+}> {
+  const opts = { ...DEFAULT_BG_REMOVE_OPTIONS, ...options };
+  const image = await loadImage(source);
+  const canvas = drawToCanvas(image);
+  const ctx = canvas.getContext('2d', { willReadFrequently: true });
+  if (!ctx) throw new Error('Canvas를 초기화하지 못했습니다.');
+
+  const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
+  const { data, width, height } = imageData;
+  const background = sampleCornerBackground(data, width, height);
+  const hard = hardLimit(opts.tolerance);
+  const soft = featherWidth(opts.feather);
+
+  if (opts.mode === 'flood') {
+    applyFlood(data, width, height, background, hard, soft);
+  } else {
+    applyThreshold(data, background, hard, soft);
+  }
+
+  ctx.putImageData(imageData, 0, 0);
+  const blob = await new Promise<Blob>((resolve, reject) => {
+    canvas.toBlob(
+      (value) =>
+        value
+          ? resolve(value)
+          : reject(new Error('투명 PNG를 만들지 못했습니다.')),
+      'image/png',
+    );
+  });
+
+  return {
+    blob,
+    url: URL.createObjectURL(blob),
+    width: canvas.width,
+    height: canvas.height,
+    background,
+  };
+}

packages/frontend/src/integrations/illustrator/loadAi.ts

@@ -0,0 +1,117 @@
+import {
+  GlobalWorkerOptions,
+  getDocument,
+  RenderingCancelledException,
+  type PDFDocumentProxy,
+  type RenderTask,
+} from 'pdfjs-dist';
+
+const WORKER_SRC = '/viewer-assets/scanner/pdfjs/pdf.worker.min.mjs';
+
+let workerConfigured = false;
+let activeRender: RenderTask | null = null;
+/** Serialize canvas renders so pdf.js never sees overlapping render() calls. */
+let renderGate: Promise<void> = Promise.resolve();
+
+function ensureWorker() {
+  if (workerConfigured) return;
+  GlobalWorkerOptions.workerSrc = WORKER_SRC;
+  workerConfigured = true;
+}
+
+/** PDF-compatible .ai embeds a PDF stream (often starts with %PDF). */
+export function looksPdfCompatibleAi(data: ArrayBuffer): boolean {
+  const n = Math.min(data.byteLength, 8192);
+  if (n < 5) return false;
+  const text = new TextDecoder('latin1').decode(data.slice(0, n));
+  return text.includes('%PDF');
+}
+
+export const AI_INCOMPATIBLE_MESSAGE =
+  'PDF 호환으로 저장된 .ai만 열 수 있습니다. Illustrator에서 「PDF 호환 파일 만들기」로 저장한 뒤 다시 열어 주세요.';
+
+export function isAiRenderCancelled(reason: unknown): boolean {
+  return (
+    reason instanceof RenderingCancelledException ||
+    (typeof reason === 'object' &&
+      reason !== null &&
+      'name' in reason &&
+      (reason as { name: string }).name === 'RenderingCancelledException')
+  );
+}
+
+export async function cancelAiRender(): Promise<void> {
+  const task = activeRender;
+  if (!task) return;
+  activeRender = null;
+  task.cancel();
+  try {
+    await task.promise;
+  } catch {
+    /* cancelled or failed after cancel */
+  }
+}
+
+export async function openAiAsPdf(data: ArrayBuffer): Promise<PDFDocumentProxy> {
+  ensureWorker();
+  if (!looksPdfCompatibleAi(data)) {
+    throw new Error(AI_INCOMPATIBLE_MESSAGE);
+  }
+  try {
+    return await getDocument({ data: data.slice(0) }).promise;
+  } catch {
+    throw new Error(AI_INCOMPATIBLE_MESSAGE);
+  }
+}
+
+export async function renderAiPage(
+  pdf: PDFDocumentProxy,
+  pageNumber: number,
+  canvas: HTMLCanvasElement,
+  scale: number,
+): Promise<{ width: number; height: number }> {
+  // Interrupt in-flight work so the gate holder can exit quickly.
+  void cancelAiRender();
+
+  let release!: () => void;
+  const previous = renderGate;
+  renderGate = new Promise<void>((resolve) => {
+    release = resolve;
+  });
+  await previous;
+
+  try {
+    await cancelAiRender();
+
+    const page = await pdf.getPage(pageNumber);
+    try {
+      const viewport = page.getViewport({ scale });
+      canvas.width = Math.max(1, Math.floor(viewport.width));
+      canvas.height = Math.max(1, Math.floor(viewport.height));
+      const context = canvas.getContext('2d', { alpha: false });
+      if (!context) {
+        throw new Error('캔버스를 초기화하지 못했습니다.');
+      }
+      context.fillStyle = '#ffffff';
+      context.fillRect(0, 0, canvas.width, canvas.height);
+
+      const task = page.render({ canvasContext: context, viewport, canvas });
+      activeRender = task;
+      try {
+        await task.promise;
+      } finally {
+        if (activeRender === task) activeRender = null;
+      }
+
+      return { width: canvas.width, height: canvas.height };
+    } finally {
+      page.cleanup();
+    }
+  } finally {
+    release();
+  }
+}
+
+export function isAiFile(file: File): boolean {
+  return /\.ai$/i.test(file.name) || file.type === 'application/postscript';
+}

packages/frontend/src/integrations/imageedit/ico.ts

@@ -0,0 +1,227 @@
+const PNG_SIG = [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a];
+
+export function isIcoFile(file: File) {
+  return (
+    /image\/(x-icon|vnd\.microsoft\.icon|icon)/i.test(file.type) ||
+    /\.ico$/i.test(file.name)
+  );
+}
+
+function isPng(bytes: Uint8Array) {
+  return (
+    bytes.length >= 8 && PNG_SIG.every((value, index) => bytes[index] === value)
+  );
+}
+
+function rowStride(width: number, bits: number) {
+  return (((width * bits + 31) >> 5) << 2);
+}
+
+function decodeDib(bytes: Uint8Array): ImageData {
+  if (bytes.length < 40) {
+    throw new Error('ICO 비트맵 헤더가 올바르지 않습니다.');
+  }
+  const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
+  const headerSize = view.getUint32(0, true);
+  if (headerSize < 40) {
+    throw new Error('지원하지 않는 ICO 비트맵입니다.');
+  }
+  const width = Math.abs(view.getInt32(4, true));
+  const rawHeight = view.getInt32(8, true);
+  const bitCount = view.getUint16(14, true);
+  const compression = view.getUint32(16, true);
+  if (!(width > 0) || compression !== 0) {
+    throw new Error('압축된 ICO 비트맵은 열 수 없습니다.');
+  }
+
+  const storedHeight = Math.abs(rawHeight) || 1;
+  const bottomUp = rawHeight >= 0;
+  const paletteColors =
+    bitCount <= 8
+      ? view.getUint32(32, true) || 1 << bitCount
+      : 0;
+  let offset = headerSize + paletteColors * 4;
+  const xorStride = rowStride(width, bitCount);
+  const remaining = Math.max(0, bytes.length - offset);
+  let height = storedHeight;
+  if (storedHeight % 2 === 0) {
+    const half = storedHeight / 2;
+    const xorHalf = xorStride * half;
+    const andHalf = rowStride(width, 1) * half;
+    if (xorHalf + andHalf <= remaining || xorHalf <= remaining) {
+      height = half;
+    }
+  }
+  const xorSize = xorStride * height;
+  if (!(height > 0) || offset + xorSize > bytes.length) {
+    throw new Error('ICO 비트맵 데이터가 잘렸습니다.');
+  }
+
+  const palette: Array<[number, number, number, number]> = [];
+  for (let i = 0; i < paletteColors; i += 1) {
+    const p = headerSize + i * 4;
+    palette.push([bytes[p + 2]!, bytes[p + 1]!, bytes[p]!, 255]);
+  }
+
+  const pixels = new Uint8ClampedArray(width * height * 4);
+  const andOffset = offset + xorSize;
+  const andStride = rowStride(width, 1);
+  const hasAnd = andOffset + andStride * height <= bytes.length;
+
+  function xorPixel(x: number, y: number): [number, number, number, number] {
+    const row = bottomUp ? height - 1 - y : y;
+    const rowStart = offset + row * xorStride;
+    if (bitCount === 32) {
+      const i = rowStart + x * 4;
+      return [bytes[i + 2]!, bytes[i + 1]!, bytes[i]!, bytes[i + 3]!];
+    }
+    if (bitCount === 24) {
+      const i = rowStart + x * 3;
+      return [bytes[i + 2]!, bytes[i + 1]!, bytes[i]!, 255];
+    }
+    if (bitCount === 8) {
+      return palette[bytes[rowStart + x]!] ?? [0, 0, 0, 255];
+    }
+    if (bitCount === 4) {
+      const byte = bytes[rowStart + (x >> 1)]!;
+      const index = x & 1 ? byte & 0x0f : byte >> 4;
+      return palette[index] ?? [0, 0, 0, 255];
+    }
+    if (bitCount === 1) {
+      const byte = bytes[rowStart + (x >> 3)]!;
+      const index = (byte >> (7 - (x & 7))) & 1;
+      return palette[index] ?? [0, 0, 0, 255];
+    }
+    throw new Error(`지원하지 않는 ICO 색 깊이입니다 (${bitCount}bit).`);
+  }
+
+  function andTransparent(x: number, y: number) {
+    if (!hasAnd) return false;
+    const row = bottomUp ? height - 1 - y : y;
+    const byte = bytes[andOffset + row * andStride + (x >> 3)]!;
+    return ((byte >> (7 - (x & 7))) & 1) === 1;
+  }
+
+  let anyAlpha = false;
+  for (let y = 0; y < height; y += 1) {
+    for (let x = 0; x < width; x += 1) {
+      const [r, g, b, a] = xorPixel(x, y);
+      if (a > 0 && a < 255) anyAlpha = true;
+      if (a === 255) anyAlpha = anyAlpha || bitCount === 32;
+      const i = (y * width + x) * 4;
+      pixels[i] = r;
+      pixels[i + 1] = g;
+      pixels[i + 2] = b;
+      pixels[i + 3] = a;
+    }
+  }
+
+  const useAnd = bitCount < 32 || !anyAlpha;
+  if (useAnd) {
+    for (let y = 0; y < height; y += 1) {
+      for (let x = 0; x < width; x += 1) {
+        if (andTransparent(x, y)) {
+          pixels[(y * width + x) * 4 + 3] = 0;
+        }
+      }
+    }
+  }
+
+  return new ImageData(pixels, width, height);
+}
+
+function canvasFromImageData(data: ImageData) {
+  const canvas = document.createElement('canvas');
+  canvas.width = data.width;
+  canvas.height = data.height;
+  const ctx = canvas.getContext('2d');
+  if (!ctx) throw new Error('캔버스를 만들 수 없습니다.');
+  ctx.putImageData(data, 0, 0);
+  return canvas;
+}
+
+function pngBlobFromCanvas(canvas: HTMLCanvasElement) {
+  return new Promise<Blob>((resolve, reject) => {
+    canvas.toBlob(
+      (blob) =>
+        blob ? resolve(blob) : reject(new Error('ICO를 PNG로 바꾸지 못했습니다.')),
+      'image/png',
+    );
+  });
+}
+
+export function wrapPngAsIco(png: ArrayBuffer, width: number, height: number) {
+  const header = 22;
+  const out = new Uint8Array(header + png.byteLength);
+  const view = new DataView(out.buffer);
+  view.setUint16(0, 0, true);
+  view.setUint16(2, 1, true);
+  view.setUint16(4, 1, true);
+  out[6] = width >= 256 ? 0 : width;
+  out[7] = height >= 256 ? 0 : height;
+  view.setUint16(10, 1, true);
+  view.setUint16(12, 32, true);
+  view.setUint32(14, png.byteLength, true);
+  view.setUint32(18, header, true);
+  out.set(new Uint8Array(png), header);
+  return new Blob([out], { type: 'image/x-icon' });
+}
+
+async function decodeEntry(bytes: Uint8Array) {
+  if (isPng(bytes)) {
+    const blob = new Blob([bytes.slice()], { type: 'image/png' });
+    const url = URL.createObjectURL(blob);
+    try {
+      const image = new Image();
+      image.decoding = 'async';
+      image.src = url;
+      await image.decode();
+      return {
+        blob,
+        width: image.naturalWidth || image.width,
+        height: image.naturalHeight || image.height,
+      };
+    } finally {
+      URL.revokeObjectURL(url);
+    }
+  }
+  const canvas = canvasFromImageData(decodeDib(bytes));
+  const blob = await pngBlobFromCanvas(canvas);
+  return { blob, width: canvas.width, height: canvas.height };
+}
+
+/** Decode an ICO and return the largest image as a PNG blob. */
+export async function decodeIcoToPng(buffer: ArrayBuffer) {
+  const view = new DataView(buffer);
+  if (view.byteLength < 22) {
+    throw new Error('ICO 파일이 너무 짧습니다.');
+  }
+  const reserved = view.getUint16(0, true);
+  const type = view.getUint16(2, true);
+  const count = view.getUint16(4, true);
+  if (reserved !== 0 || (type !== 1 && type !== 2) || count < 1) {
+    throw new Error('올바른 ICO 파일이 아닙니다.');
+  }
+
+  const bytes = new Uint8Array(buffer);
+  let best: { score: number; offset: number; size: number } | null = null;
+  for (let i = 0; i < count; i += 1) {
+    const entry = 6 + i * 16;
+    const width = view.getUint8(entry) || 256;
+    const height = view.getUint8(entry + 1) || 256;
+    const size = view.getUint32(entry + 8, true);
+    const offset = view.getUint32(entry + 12, true);
+    if (offset + size > buffer.byteLength) continue;
+    const score = width * height + size;
+    if (!best || score > best.score) {
+      best = { score, offset, size };
+    }
+  }
+  if (!best) {
+    throw new Error('ICO에서 이미지를 찾지 못했습니다.');
+  }
+
+  const slice = bytes.subarray(best.offset, best.offset + best.size);
+  const decoded = await decodeEntry(slice);
+  return { ...decoded, imageCount: count };
+}

packages/frontend/src/integrations/imageedit/process.ts

@@ -0,0 +1,307 @@
+import { wrapPngAsIco } from './ico';
+
+export type PixelRect = {
+  x: number;
+  y: number;
+  width: number;
+  height: number;
+};
+
+export type ExportFormat = 'image/jpeg' | 'image/webp' | 'image/png' | 'image/x-icon';
+
+export type RatioFit = 'crop' | 'pad';
+
+const MIN_CROP = 8;
+
+export function loadImageFromUrl(url: string) {
+  return new Promise<HTMLImageElement>((resolve, reject) => {
+    const image = new Image();
+    image.decoding = 'async';
+    image.onload = () => resolve(image);
+    image.onerror = () => reject(new Error('이미지를 불러오지 못했습니다.'));
+    image.src = url;
+  });
+}
+
+export function clampCrop(
+  crop: PixelRect,
+  imageWidth: number,
+  imageHeight: number,
+): PixelRect {
+  const maxW = Math.max(1, Math.floor(imageWidth));
+  const maxH = Math.max(1, Math.floor(imageHeight));
+  const width = Math.min(Math.max(MIN_CROP, Math.round(crop.width)), maxW);
+  const height = Math.min(Math.max(MIN_CROP, Math.round(crop.height)), maxH);
+  const x = Math.min(Math.max(0, Math.round(crop.x)), maxW - width);
+  const y = Math.min(Math.max(0, Math.round(crop.y)), maxH - height);
+  return { x, y, width, height };
+}
+
+export function fullImageCrop(imageWidth: number, imageHeight: number): PixelRect {
+  return clampCrop(
+    { x: 0, y: 0, width: imageWidth, height: imageHeight },
+    imageWidth,
+    imageHeight,
+  );
+}
+
+/** Largest rectangle of `aspect` (width/height) that fits in the image. */
+export function maxCropForAspect(
+  imageWidth: number,
+  imageHeight: number,
+  aspect: number,
+  center?: { x: number; y: number },
+): PixelRect {
+  if (!(aspect > 0) || !Number.isFinite(aspect)) {
+    return fullImageCrop(imageWidth, imageHeight);
+  }
+  let width = imageWidth;
+  let height = width / aspect;
+  if (height > imageHeight) {
+    height = imageHeight;
+    width = height * aspect;
+  }
+  const cx = center?.x ?? imageWidth / 2;
+  const cy = center?.y ?? imageHeight / 2;
+  return clampCrop(
+    { x: cx - width / 2, y: cy - height / 2, width, height },
+    imageWidth,
+    imageHeight,
+  );
+}
+
+export function formatBytes(bytes: number) {
+  if (!Number.isFinite(bytes) || bytes < 0) return '—';
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
+  return `${(bytes / (1024 * 1024)).toFixed(2)} MB`;
+}
+
+export function extensionForFormat(format: ExportFormat) {
+  if (format === 'image/jpeg') return 'jpg';
+  if (format === 'image/webp') return 'webp';
+  if (format === 'image/x-icon') return 'ico';
+  return 'png';
+}
+
+export function clampPixelSize(value: number) {
+  return Math.min(8192, Math.max(1, Math.round(Number(value)) || 1));
+}
+
+function outputSize(
+  srcWidth: number,
+  srcHeight: number,
+  scale: number,
+  maxEdge: number | null,
+  padAspect: number | null,
+  targetWidth?: number | null,
+  targetHeight?: number | null,
+) {
+  let width = Math.max(1, srcWidth);
+  let height = Math.max(1, srcHeight);
+
+  if (padAspect && padAspect > 0) {
+    const current = width / height;
+    if (current < padAspect) {
+      width = height * padAspect;
+    } else if (current > padAspect) {
+      height = width / padAspect;
+    }
+  }
+
+  if (
+    targetWidth != null &&
+    targetHeight != null &&
+    targetWidth > 0 &&
+    targetHeight > 0
+  ) {
+    width = targetWidth;
+    height = targetHeight;
+  } else {
+    const factor = Math.min(8, Math.max(0.01, scale));
+    width *= factor;
+    height *= factor;
+  }
+
+  if (maxEdge && maxEdge > 0) {
+    const cap = Math.min(1, maxEdge / width, maxEdge / height);
+    width *= cap;
+    height *= cap;
+  }
+
+  return {
+    width: clampPixelSize(width),
+    height: clampPixelSize(height),
+  };
+}
+
+export function previewOutputSize(options: {
+  crop: PixelRect;
+  scale: number;
+  maxEdge: number | null;
+  padAspect: number | null;
+  fit: RatioFit;
+  targetWidth?: number | null;
+  targetHeight?: number | null;
+}) {
+  const padAspect = options.fit === 'pad' ? options.padAspect : null;
+  return outputSize(
+    options.crop.width,
+    options.crop.height,
+    options.scale,
+    options.maxEdge,
+    padAspect,
+    options.targetWidth,
+    options.targetHeight,
+  );
+}
+
+function canvasToBlob(
+  canvas: HTMLCanvasElement,
+  format: ExportFormat,
+  quality: number,
+) {
+  const mime = format === 'image/x-icon' ? 'image/png' : format;
+  return new Promise<Blob>((resolve, reject) => {
+    const q =
+      mime === 'image/png' ? undefined : Math.min(1, Math.max(0.01, quality));
+    canvas.toBlob(
+      (blob) => {
+        if (!blob) {
+          reject(new Error('이미지를 인코딩하지 못했습니다.'));
+          return;
+        }
+        resolve(blob);
+      },
+      mime,
+      q,
+    );
+  });
+}
+
+function parseCssColor(color: string): { r: number; g: number; b: number } {
+  const hex = color.trim();
+  const short = /^#([0-9a-f]{3})$/i.exec(hex);
+  if (short) {
+    const n = short[1];
+    return {
+      r: Number.parseInt(n[0] + n[0], 16),
+      g: Number.parseInt(n[1] + n[1], 16),
+      b: Number.parseInt(n[2] + n[2], 16),
+    };
+  }
+  const full = /^#([0-9a-f]{6})$/i.exec(hex);
+  if (full) {
+    const n = full[1];
+    return {
+      r: Number.parseInt(n.slice(0, 2), 16),
+      g: Number.parseInt(n.slice(2, 4), 16),
+      b: Number.parseInt(n.slice(4, 6), 16),
+    };
+  }
+  return { r: 255, g: 255, b: 255 };
+}
+
+export async function exportEditedImage(options: {
+  image: HTMLImageElement;
+  crop: PixelRect;
+  scale: number;
+  maxEdge: number | null;
+  format: ExportFormat;
+  quality: number;
+  fit: RatioFit;
+  padAspect: number | null;
+  padColor: string;
+  targetWidth?: number | null;
+  targetHeight?: number | null;
+  lockAspect?: boolean;
+}): Promise<{ blob: Blob; width: number; height: number }> {
+  const crop = clampCrop(
+    options.crop,
+    options.image.naturalWidth || options.image.width,
+    options.image.naturalHeight || options.image.height,
+  );
+  const padAspect =
+    options.fit === 'pad' && options.padAspect && options.padAspect > 0
+      ? options.padAspect
+      : null;
+  const size = outputSize(
+    crop.width,
+    crop.height,
+    options.scale,
+    options.maxEdge,
+    padAspect,
+    options.targetWidth,
+    options.targetHeight,
+  );
+
+  const canvas = document.createElement('canvas');
+  canvas.width = size.width;
+  canvas.height = size.height;
+  const ctx = canvas.getContext('2d');
+  if (!ctx) throw new Error('캔버스를 만들 수 없습니다.');
+
+  if (options.format === 'image/jpeg' || padAspect) {
+    const { r, g, b } = parseCssColor(options.padColor);
+    ctx.fillStyle = `rgb(${r}, ${g}, ${b})`;
+    ctx.fillRect(0, 0, size.width, size.height);
+  } else {
+    ctx.clearRect(0, 0, size.width, size.height);
+  }
+
+  ctx.imageSmoothingEnabled = true;
+  ctx.imageSmoothingQuality = 'high';
+
+  const letterbox = Boolean(padAspect) && options.lockAspect !== false;
+  if (letterbox) {
+    const fitted = containSize(crop.width, crop.height, size.width, size.height);
+    const dx = Math.round((size.width - fitted.width) / 2);
+    const dy = Math.round((size.height - fitted.height) / 2);
+    ctx.drawImage(
+      options.image,
+      crop.x,
+      crop.y,
+      crop.width,
+      crop.height,
+      dx,
+      dy,
+      fitted.width,
+      fitted.height,
+    );
+  } else {
+    ctx.drawImage(
+      options.image,
+      crop.x,
+      crop.y,
+      crop.width,
+      crop.height,
+      0,
+      0,
+      size.width,
+      size.height,
+    );
+  }
+
+  const blob = await canvasToBlob(canvas, options.format, options.quality);
+  if (options.format === 'image/x-icon') {
+    return {
+      blob: wrapPngAsIco(await blob.arrayBuffer(), size.width, size.height),
+      width: size.width,
+      height: size.height,
+    };
+  }
+  return { blob, width: size.width, height: size.height };
+}
+
+function containSize(
+  srcW: number,
+  srcH: number,
+  boxW: number,
+  boxH: number,
+) {
+  const scale = Math.min(boxW / srcW, boxH / srcH);
+  return {
+    width: Math.max(1, Math.round(srcW * scale)),
+    height: Math.max(1, Math.round(srcH * scale)),
+  };
+}

packages/frontend/src/integrations/markdown/render.ts

@@ -0,0 +1,29 @@
+import { marked } from 'marked';
+import DOMPurify from 'dompurify';
+
+marked.setOptions({
+  gfm: true,
+  breaks: true,
+});
+
+DOMPurify.addHook('afterSanitizeAttributes', (node) => {
+  if (node instanceof HTMLAnchorElement) {
+    node.setAttribute('target', '_blank');
+    node.setAttribute('rel', 'noopener noreferrer');
+  }
+});
+
+export function renderMarkdown(source: string): string {
+  const html = marked.parse(source ?? '', { async: false });
+  return DOMPurify.sanitize(typeof html === 'string' ? html : '', {
+    USE_PROFILES: { html: true },
+  });
+}
+
+export function isMarkdownFile(file: File) {
+  return (
+    file.type === 'text/markdown' ||
+    file.type === 'text/x-markdown' ||
+    /\.(?:md|markdown|mdown)$/i.test(file.name)
+  );
+}

packages/frontend/src/integrations/model3d/pointCloudPly.ts

@@ -0,0 +1,84 @@
+import {
+  BufferGeometry,
+  Color,
+  Group,
+  Points,
+  PointsMaterial,
+} from 'three';
+import { PLYLoader } from 'three/examples/jsm/loaders/PLYLoader.js';
+import type { ModelPropertyGroup, ModelStats, ModelTreeNode } from './types';
+
+export function isPlyFileName(name: string) {
+  return /\.ply$/i.test(name);
+}
+
+export function isNoFacesImportError(message: string) {
+  return /no faces/i.test(message);
+}
+
+export async function createPointCloudFromPly(file: File): Promise<{
+  object: Group;
+  pointCount: number;
+  hasColors: boolean;
+  stats: ModelStats;
+  tree: ModelTreeNode;
+  groups: ModelPropertyGroup[];
+}> {
+  const buffer = await file.arrayBuffer();
+  const geometry = new PLYLoader().parse(buffer) as BufferGeometry;
+  const position = geometry.getAttribute('position');
+  if (!position || position.count < 1) {
+    throw new Error('PLY에 표시할 포인트가 없습니다.');
+  }
+
+  geometry.computeBoundingSphere();
+  const hasColors = Boolean(geometry.getAttribute('color'));
+  const radius = geometry.boundingSphere?.radius || 1;
+  const material = new PointsMaterial({
+    size: Math.max(radius / 250, 0.0005),
+    sizeAttenuation: true,
+    vertexColors: hasColors,
+    color: hasColors ? new Color(0xffffff) : new Color(0x4fc3f7),
+  });
+
+  const points = new Points(geometry, material);
+  points.name = file.name;
+  const object = new Group();
+  object.name = file.name;
+  object.add(points);
+
+  const pointCount = position.count;
+  const stats: ModelStats = {
+    nodes: 1,
+    meshes: 0,
+    meshInstances: 0,
+    vertices: pointCount,
+    triangles: 0,
+    materials: 1,
+  };
+  const tree: ModelTreeNode = {
+    id: 'pointcloud-root',
+    name: file.name,
+    type: '포인트 클라우드',
+    children: [
+      {
+        id: 'pointcloud-points',
+        name: `포인트 ${pointCount.toLocaleString()}개`,
+        type: 'points',
+        children: [],
+      },
+    ],
+  };
+  const groups: ModelPropertyGroup[] = [
+    {
+      name: '포인트 클라우드',
+      properties: [
+        { name: '파일', value: file.name },
+        { name: '포인트', value: pointCount.toLocaleString() },
+        { name: '정점 색', value: hasColors ? '있음' : '없음' },
+      ],
+    },
+  ];
+
+  return { object, pointCount, hasColors, stats, tree, groups };
+}

packages/frontend/src/integrations/photoshop/loadPsd.ts

@@ -0,0 +1,57 @@
+import { readPsd, type Psd } from 'ag-psd';
+
+export const PSD_INCOMPATIBLE_MESSAGE =
+  '이 브라우저에서는 RGB·Grayscale·Bitmap / 8bit .psd만 안정적으로 볼 수 있습니다. CMYK·16bit·PSB는 지원하지 않습니다.';
+
+export type OpenedPsd = {
+  width: number;
+  height: number;
+  /** Composite image produced by ag-psd */
+  canvas: HTMLCanvasElement;
+};
+
+export function isPsdFile(file: File): boolean {
+  return (
+    /\.psd$/i.test(file.name) || file.type === 'image/vnd.adobe.photoshop'
+  );
+}
+
+export function openPsd(data: ArrayBuffer): OpenedPsd {
+  let psd: Psd;
+  try {
+    psd = readPsd(data);
+  } catch {
+    throw new Error(PSD_INCOMPATIBLE_MESSAGE);
+  }
+
+  const source = psd.canvas;
+  if (!source || source.width < 1 || source.height < 1) {
+    throw new Error(PSD_INCOMPATIBLE_MESSAGE);
+  }
+
+  return {
+    width: psd.width || source.width,
+    height: psd.height || source.height,
+    canvas: source as HTMLCanvasElement,
+  };
+}
+
+export function drawPsdToCanvas(
+  source: HTMLCanvasElement,
+  target: HTMLCanvasElement,
+  scale: number,
+): { width: number; height: number } {
+  const width = Math.max(1, Math.floor(source.width * scale));
+  const height = Math.max(1, Math.floor(source.height * scale));
+  target.width = width;
+  target.height = height;
+  const context = target.getContext('2d', { alpha: true });
+  if (!context) {
+    throw new Error('캔버스를 초기화하지 못했습니다.');
+  }
+  context.clearRect(0, 0, width, height);
+  context.imageSmoothingEnabled = true;
+  context.imageSmoothingQuality = 'high';
+  context.drawImage(source, 0, 0, width, height);
+  return { width, height };
+}

packages/frontend/src/integrations/scanner/buildPdf.ts

@@ -21,6 +21,14 @@ async function loadCjkFont(pdf: PDFDocument) {
   return pdf.embedFont(bytes, { subset: true });
 }
 
+/** 스캔 페이지의 긴 변을 A4 긴 변(297mm = 841.89pt)으로 맞춘다 — 픽셀 수를 그대로 pt로 쓰면 종이가 수십 cm가 된다 */
+const PAGE_LONG_PT = 841.89;
+
+const isJpeg = (bytes: ArrayBuffer) => {
+  const b = new Uint8Array(bytes, 0, 2);
+  return b[0] === 0xff && b[1] === 0xd8;
+};
+
 export async function buildSearchablePdf(pages: PdfPageInput[]) {
   if (!pages.length) {
     throw new Error('PDF로 내보낼 페이지가 없습니다.');
@@ -42,13 +50,18 @@ export async function buildSearchablePdf(pages: PdfPageInput[]) {
   }
 
   for (const page of pages) {
-    const image = await pdf.embedPng(page.imageBytes);
+    const image = isJpeg(page.imageBytes)
-    const pdfPage = pdf.addPage([page.width, page.height]);
+      ? await pdf.embedJpg(page.imageBytes)
+      : await pdf.embedPng(page.imageBytes);
+    const k = PAGE_LONG_PT / Math.max(page.width, page.height);
+    const pageWidth = page.width * k;
+    const pageHeight = page.height * k;
+    const pdfPage = pdf.addPage([pageWidth, pageHeight]);
     pdfPage.drawImage(image, {
       x: 0,
       y: 0,
-      width: page.width,
+      width: pageWidth,
-      height: page.height,
+      height: pageHeight,
     });
 
     const font = cjkFont ?? latinFont;
@@ -57,11 +70,12 @@ export async function buildSearchablePdf(pages: PdfPageInput[]) {
         const text = word.text.trim();
         if (!text) continue;
         if (!cjkFont && /[^\u0000-\u007f]/.test(text)) continue;
-        const boxWidth = Math.max(1, word.bbox.x1 - word.bbox.x0);
+        // OCR 좌표는 스캔 이미지 픽셀 기준 → pt로 환산
-        const boxHeight = Math.max(1, word.bbox.y1 - word.bbox.y0);
+        const boxWidth = Math.max(1, (word.bbox.x1 - word.bbox.x0) * k);
-        const fontSize = Math.max(4, Math.min(boxHeight * 0.9, boxWidth));
+        const boxHeight = Math.max(1, (word.bbox.y1 - word.bbox.y0) * k);
-        const x = word.bbox.x0;
+        const fontSize = Math.max(2, Math.min(boxHeight * 0.9, boxWidth));
-        const y = page.height - word.bbox.y1;
+        const x = word.bbox.x0 * k;
+        const y = pageHeight - word.bbox.y1 * k;
         try {
           pdfPage.drawText(text, {
             x,

packages/frontend/src/integrations/scanner/ocr.ts

@@ -1,11 +1,12 @@
 import * as ort from 'onnxruntime-web';
+import ortWasmUrl from 'onnxruntime-web/ort-wasm-simd-threaded.jsep.wasm?url';
+import ortMjsUrl from 'onnxruntime-web/ort-wasm-simd-threaded.jsep.mjs?url';
 import {
   PaddleOcrService,
   V5_KOREAN_MOBILE_MODEL,
 } from 'ppu-paddle-ocr/web';
 import type { OcrResult, OcrWord } from './types';
 
-const ORT_WASM_PATH = '/viewer-assets/scanner/ort/';
 const PADDLE_BASE = '/viewer-assets/scanner/paddle';
 
 let servicePromise: Promise<PaddleOcrService> | null = null;
@@ -44,7 +45,12 @@ async function getService(
   if (!servicePromise) {
     servicePromise = (async () => {
       onProgress?.(0.05, 'OCR 모델 준비 중');
-      ort.env.wasm.wasmPaths = ORT_WASM_PATH;
+      // Vite는 /public .mjs 를 import() 하면 실패하므로 node_modules 에셋 URL 사용
+      ort.env.wasm.numThreads = 1;
+      ort.env.wasm.wasmPaths = {
+        wasm: ortWasmUrl,
+        mjs: ortMjsUrl,
+      };
       const service = new PaddleOcrService({
         model: {
           ...V5_KOREAN_MOBILE_MODEL,

packages/frontend/src/integrations/scanner/types.ts

@@ -12,6 +12,9 @@ export interface CornerPoints {
 
 export type PaperAspect = 'a4-portrait' | 'a4-landscape' | 'square' | 'auto';
 
+/** 원본: 원근 보정만 · 컬러/회색조 문서: 조명 평탄화·글자 보정 · 흑백 문서: 이진화 */
+export type ScanMode = 'original' | 'color' | 'gray' | 'bw';
+
 export interface OcrWord {
   text: string;
   /** Pixel bbox on the warped image: x0,y0,x1,y1 */
@@ -32,6 +35,9 @@ export interface ScannerPage {
   sourceHeight: number;
   corners: CornerPoints;
   aspect: PaperAspect;
+  scanMode: ScanMode;
+  /** 글자 진하기·선명도 0–100 (흑백은 이진화 문턱) */
+  scanIntensity: number;
   warpedUrl: string | null;
   warpedWidth: number;
   warpedHeight: number;

packages/frontend/src/integrations/scanner/warp.ts

@@ -1,40 +1,251 @@
-import {
+import { ensureOpenCv, loadImageFromUrl } from './detect';
-  createScanner,
+import type { CornerPoints, PaperAspect, ScanMode } from './types';
-  ensureJscanify,
-  loadImageFromUrl,
-} from './detect';
-import type { CornerPoints, PaperAspect } from './types';
 
+/** 0 = 은은하게 · 100 = 글자를 아주 진하고 선명하게 (조명 평탄화는 강도와 무관하게 항상) */
+export const DEFAULT_SCAN_INTENSITY = 60;
+export const DEFAULT_SCAN_MODE: ScanMode = 'color';
+
+const A_RATIO = Math.SQRT2; // A 계열 용지 (A4 등)
+const LETTER_RATIO = 11 / 8.5;
+/** 원본이 이보다 크면 줄여서 처리 (48MP 사진 등에서 WASM 메모리 부족 방지) */
+const MAX_SOURCE_SIDE = 4096;
+
+// jscanify에 들어 있는 OpenCV.js(4.7)에는 타입 정의가 없다
+type Cv = any;
+type Mat = any;
+
+const dist = (a: { x: number; y: number }, b: { x: number; y: number }) =>
+  Math.hypot(a.x - b.x, a.y - b.y);
+const odd = (n: number) => Math.round(n) | 1;
+
+function edgeAspect(c: CornerPoints) {
+  const w =
+    (dist(c.topLeftCorner, c.topRightCorner) +
+      dist(c.bottomLeftCorner, c.bottomRightCorner)) /
+    2;
+  const h =
+    (dist(c.topLeftCorner, c.bottomLeftCorner) +
+      dist(c.topRightCorner, c.bottomRightCorner)) /
+    2;
+  return w / Math.max(h, 1);
+}
+
+/**
+ * 원근을 고려한 실제 용지 가로/세로 비.
+ * 비스듬히 찍으면 먼 쪽 변이 짧아져 변 길이만으로는 비율이 크게 틀어진다(늘어난 듯한 결과).
+ * Zhang & He, "Whiteboard scanning and image enhancement"(2007) — 주점은 사진 중앙으로 가정.
+ * 정면에 가깝거나 값이 불안정하면 변 길이 평균으로 대신한다.
+ */
+export function estimateAspect(
+  c: CornerPoints,
+  imageWidth: number,
+  imageHeight: number,
+) {
+  type V3 = [number, number, number];
+  const u0 = imageWidth / 2;
+  const v0 = imageHeight / 2;
+  const p = (pt: { x: number; y: number }): V3 => [pt.x - u0, pt.y - v0, 1];
+  const cross = (a: V3, b: V3): V3 => [
+    a[1] * b[2] - a[2] * b[1],
+    a[2] * b[0] - a[0] * b[2],
+    a[0] * b[1] - a[1] * b[0],
+  ];
+  const dot = (a: V3, b: V3) => a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
+  const m1 = p(c.topLeftCorner);
+  const m2 = p(c.topRightCorner);
+  const m3 = p(c.bottomLeftCorner);
+  const m4 = p(c.bottomRightCorner);
+  const c14 = cross(m1, m4);
+  const k2 = dot(c14, m3) / dot(cross(m2, m4), m3);
+  const k3 = dot(c14, m2) / dot(cross(m3, m4), m2);
+  const n2 = m2.map((v, i) => k2 * v - m1[i]!) as V3;
+  const n3 = m3.map((v, i) => k3 * v - m1[i]!) as V3;
+  const denom = n2[2] * n3[2];
+  if (!Number.isFinite(k2) || !Number.isFinite(k3) || Math.abs(denom) < 1e-9) {
+    return edgeAspect(c);
+  }
+  const f2 = -(n2[0] * n3[0] + n2[1] * n3[1]) / denom;
+  const maxDim = Math.max(imageWidth, imageHeight);
+  if (!(f2 > 0) || Math.sqrt(f2) < maxDim * 0.3 || Math.sqrt(f2) > maxDim * 6) {
+    return edgeAspect(c);
+  }
+  const ratio = Math.sqrt(
+    (n2[0] ** 2 + n2[1] ** 2 + n2[2] ** 2 * f2) /
+      (n3[0] ** 2 + n3[1] ** 2 + n3[2] ** 2 * f2),
+  );
+  return Number.isFinite(ratio) && ratio > 0.15 && ratio < 7
+    ? ratio
+    : edgeAspect(c);
+}
+
+/** 흔한 용지 비율(A 계열, Letter)과 4% 안쪽이면 그 비율로 맞춘다 */
+function snapAspect(ratio: number) {
+  for (const target of [A_RATIO, LETTER_RATIO]) {
+    for (const t of [target, 1 / target]) {
+      if (Math.abs(ratio / t - 1) < 0.04) return t;
+    }
+  }
+  return ratio;
+}
+
+/** 결과 크기: 비율은 용지 설정(자동이면 원근 추정), 긴 변은 원본에서 문서가 차지한 픽셀 수 기준
+ *  (1754–3508px = A4 150–300dpi, 원본보다 크게 늘리지 않음) */
 export function outputSizeForAspect(
   aspect: PaperAspect,
   corners: CornerPoints,
+  imageWidth: number,
+  imageHeight: number,
 ) {
-  if (aspect === 'a4-portrait') return { width: 1240, height: 1754 };
+  let ratio: number;
-  if (aspect === 'a4-landscape') return { width: 1754, height: 1240 };
+  if (aspect === 'a4-portrait') ratio = 1 / A_RATIO;
-  if (aspect === 'square') return { width: 1400, height: 1400 };
+  else if (aspect === 'a4-landscape') ratio = A_RATIO;
+  else if (aspect === 'square') ratio = 1;
+  else ratio = snapAspect(estimateAspect(corners, imageWidth, imageHeight));
+  const sourceLong = Math.max(
+    dist(corners.topLeftCorner, corners.topRightCorner),
+    dist(corners.bottomLeftCorner, corners.bottomRightCorner),
+    dist(corners.topLeftCorner, corners.bottomLeftCorner),
+    dist(corners.topRightCorner, corners.bottomRightCorner),
+  );
+  const long = Math.round(Math.min(3508, Math.max(1754, sourceLong * 1.1)));
+  return ratio >= 1
+    ? { width: long, height: Math.max(1, Math.round(long / ratio)) }
+    : { width: Math.max(1, Math.round(long * ratio)), height: long };
+}
 
-  const widthTop = Math.hypot(
+/** 원근 보정 (RGB → RGB). 가장자리는 늘려 채워 검은 테두리가 생기지 않게 한다 */
-    corners.topRightCorner.x - corners.topLeftCorner.x,
+function warpMat(
-    corners.topRightCorner.y - corners.topLeftCorner.y,
+  cv: Cv,
+  src: Mat,
+  c: CornerPoints,
+  size: { width: number; height: number },
+) {
+  const from = cv.matFromArray(4, 1, cv.CV_32FC2, [
+    c.topLeftCorner.x, c.topLeftCorner.y,
+    c.topRightCorner.x, c.topRightCorner.y,
+    c.bottomRightCorner.x, c.bottomRightCorner.y,
+    c.bottomLeftCorner.x, c.bottomLeftCorner.y,
+  ]);
+  // 가장자리를 0.4% 안쪽으로 잘라 코너 오차로 섞여 든 책상·그림자 테두리를 없앤다
+  const m = Math.round(Math.max(size.width, size.height) * 0.004);
+  const to = cv.matFromArray(4, 1, cv.CV_32FC2, [
+    -m, -m, size.width + m, -m, size.width + m, size.height + m, -m, size.height + m,
+  ]);
+  const transform = cv.getPerspectiveTransform(from, to);
+  const out = new cv.Mat();
+  cv.warpPerspective(
+    src, out, transform, new cv.Size(size.width, size.height),
+    cv.INTER_CUBIC, cv.BORDER_REPLICATE,
   );
-  const widthBottom = Math.hypot(
+  from.delete();
-    corners.bottomRightCorner.x - corners.bottomLeftCorner.x,
+  to.delete();
-    corners.bottomRightCorner.y - corners.bottomLeftCorner.y,
+  transform.delete();
+  return out;
+}
+
+/**
+ * 조명 평탄화: 글자를 지운 종이 배경(밝은 쪽 팽창 + 메디안 블러)을 추정해 원본을 나눈다.
+ * 그림자·밝기 차이·누런 조명이 사라지고 종이는 흰색, 도장·서명 같은 색은 남는다.
+ */
+function flatten(cv: Cv, src: Mat) {
+  const scale = Math.min(1, 640 / Math.max(src.cols, src.rows));
+  const small = new cv.Mat();
+  cv.resize(
+    src, small,
+    new cv.Size(Math.round(src.cols * scale), Math.round(src.rows * scale)),
+    0, 0, cv.INTER_AREA,
   );
-  const heightLeft = Math.hypot(
+  const kernel = cv.getStructuringElement(cv.MORPH_ELLIPSE, new cv.Size(9, 9));
-    corners.bottomLeftCorner.x - corners.topLeftCorner.x,
+  cv.dilate(small, small, kernel);
-    corners.bottomLeftCorner.y - corners.topLeftCorner.y,
+  cv.medianBlur(small, small, 31);
+  cv.GaussianBlur(small, small, new cv.Size(0, 0), 3);
+  const background = new cv.Mat();
+  cv.resize(small, background, new cv.Size(src.cols, src.rows), 0, 0, cv.INTER_LINEAR);
+  const out = new cv.Mat();
+  cv.divide(src, background, out, 255);
+  small.delete();
+  kernel.delete();
+  background.delete();
+  return out;
+}
+
+/** 레벨 보정: 잉크 쪽 하위 blackPct를 0으로 당기고 감마로 글자를 진하게 (이 빌드에는 cv.LUT가 없다) */
+function levels(mat: Mat, blackPct: number, gamma: number, whiteAt = 245) {
+  const data = mat.data as Uint8Array;
+  const hist = new Uint32Array(256);
+  for (let i = 0; i < data.length; i += 1) hist[data[i]!] += 1;
+  const target = data.length * blackPct;
+  let acc = 0;
+  let black = 0;
+  for (let v = 0; v < 256; v += 1) {
+    acc += hist[v]!;
+    if (acc >= target) {
+      black = v;
+      break;
+    }
+  }
+  black = Math.min(black, whiteAt - 40);
+  const lut = new Uint8Array(256);
+  for (let v = 0; v < 256; v += 1) {
+    const t = Math.min(1, Math.max(0, (v - black) / (whiteAt - black)));
+    lut[v] = Math.round(255 * t ** gamma);
+  }
+  for (let i = 0; i < data.length; i += 1) data[i] = lut[data[i]!]!;
+}
+
+function sharpen(cv: Cv, mat: Mat, amount: number) {
+  const blur = new cv.Mat();
+  cv.GaussianBlur(mat, blur, new cv.Size(0, 0), 1.1);
+  cv.addWeighted(mat, 1 + amount, blur, -amount, 0, mat);
+  blur.delete();
+}
+
+/** 스캔 필터. 원본: 원근 보정만 · 컬러/회색조: 조명 평탄화 + 글자 진하게 + 선명 · 흑백: 적응형 이진화 */
+function enhance(cv: Cv, src: Mat, mode: ScanMode, intensity: number) {
+  const a = Math.min(100, Math.max(0, intensity)) / 100;
+  if (mode === 'original') return src.clone();
+  let base = src;
+  if (mode === 'gray' || mode === 'bw') {
+    base = new cv.Mat();
+    cv.cvtColor(src, base, cv.COLOR_RGB2GRAY);
+  }
+  const flat = flatten(cv, base);
+  if (base !== src) base.delete();
+  if (mode === 'bw') {
+    const out = new cv.Mat();
+    cv.adaptiveThreshold(
+      flat, out, 255, cv.ADAPTIVE_THRESH_GAUSSIAN_C, cv.THRESH_BINARY,
+      odd(Math.max(flat.cols, flat.rows) / 70), 6 + 14 * a,
     );
-  const heightRight = Math.hypot(
+    flat.delete();
-    corners.bottomRightCorner.x - corners.topRightCorner.x,
+    return out;
-    corners.bottomRightCorner.y - corners.topRightCorner.y,
+  }
-  );
+  levels(flat, 0.002 + 0.02 * a, 1 + 0.6 * a);
-  const width = Math.max(widthTop, widthBottom, 1);
+  sharpen(cv, flat, 0.3 + 0.5 * a);
-  const height = Math.max(heightLeft, heightRight, 1);
+  return flat;
-  const scale = Math.min(1800 / width, 1800 / height, 1);
+}
+
+/** 원본을 캔버스에 그린다. 너무 크면 줄이고 그 배율을 돌려준다 */
+function sourceCanvas(image: HTMLImageElement) {
+  const w = image.naturalWidth || image.width;
+  const h = image.naturalHeight || image.height;
+  const scale = Math.min(1, MAX_SOURCE_SIDE / Math.max(w, h));
+  const canvas = document.createElement('canvas');
+  canvas.width = Math.max(1, Math.round(w * scale));
+  canvas.height = Math.max(1, Math.round(h * scale));
+  const ctx = canvas.getContext('2d', { willReadFrequently: true });
+  if (!ctx) throw new Error('Canvas를 초기화하지 못했습니다.');
+  ctx.drawImage(image, 0, 0, canvas.width, canvas.height);
+  return { canvas, scale };
+}
+
+function scaleCorners(c: CornerPoints, s: number): CornerPoints {
+  const f = (p: { x: number; y: number }) => ({ x: p.x * s, y: p.y * s });
   return {
-    width: Math.max(1, Math.round(width * scale)),
+    topLeftCorner: f(c.topLeftCorner),
-    height: Math.max(1, Math.round(height * scale)),
+    topRightCorner: f(c.topRightCorner),
+    bottomRightCorner: f(c.bottomRightCorner),
+    bottomLeftCorner: f(c.bottomLeftCorner),
   };
 }
 
@@ -42,27 +253,47 @@ export async function warpImage(
   sourceUrl: string,
   corners: CornerPoints,
   aspect: PaperAspect,
+  scanIntensity: number = DEFAULT_SCAN_INTENSITY,
+  scanMode: ScanMode = DEFAULT_SCAN_MODE,
 ) {
-  await ensureJscanify();
+  await ensureOpenCv();
+  const cv: Cv = window.cv;
   const image = await loadImageFromUrl(sourceUrl);
-  const size = outputSizeForAspect(aspect, corners);
+  const { canvas: source, scale } = sourceCanvas(image);
-  const scanner = createScanner();
+  const c = scaleCorners(corners, scale);
-  const canvas = scanner.extractPaper(
+  const size = outputSizeForAspect(aspect, c, source.width, source.height);
-    image,
+
-    size.width,
+  const rgba = cv.imread(source);
-    size.height,
+  const rgb = new cv.Mat();
-    corners,
+  cv.cvtColor(rgba, rgb, cv.COLOR_RGBA2RGB);
+  rgba.delete();
+  let warped: Mat = null;
+  let result: Mat = null;
+  const canvas = document.createElement('canvas');
+  try {
+    warped = warpMat(cv, rgb, c, size);
+    result = enhance(cv, warped, scanMode, scanIntensity);
+    cv.imshow(canvas, result);
+  } catch (reason) {
+    throw new Error(
+      `문서 보정에 실패했습니다: ${reason instanceof Error ? reason.message : String(reason)}`,
     );
-  if (!canvas) {
+  } finally {
-    throw new Error('문서 영역을 추출하지 못했습니다.');
+    rgb.delete();
+    warped?.delete();
+    result?.delete();
   }
+
+  // 흑백은 PNG가 작고 선명하다. 컬러·회색조는 JPEG(PNG면 페이지당 10MB 이상)
+  const type = scanMode === 'bw' ? 'image/png' : 'image/jpeg';
   const blob = await new Promise<Blob>((resolve, reject) => {
     canvas.toBlob(
       (value) =>
         value
           ? resolve(value)
           : reject(new Error('보정 이미지를 만들지 못했습니다.')),
-      'image/png',
+      type,
+      0.92,
     );
   });
   return {

packages/frontend/src/router/index.ts

@@ -44,11 +44,36 @@ const router = createRouter({
       name: 'model3d-viewer',
       component: () => import('@/views/Model3DViewerView.vue'),
     },
+    {
+      path: '/viewer/illustrator',
+      name: 'illustrator-viewer',
+      component: () => import('@/views/IllustratorViewerView.vue'),
+    },
+    {
+      path: '/viewer/photoshop',
+      name: 'photoshop-viewer',
+      component: () => import('@/views/PhotoshopViewerView.vue'),
+    },
+    {
+      path: '/viewer/markdown',
+      name: 'markdown-viewer',
+      component: () => import('@/views/MarkdownViewerView.vue'),
+    },
     {
       path: '/tools/scanner',
       name: 'tools-scanner',
       component: () => import('@/views/ToolsScannerView.vue'),
     },
+    {
+      path: '/tools/bg-remove',
+      name: 'tools-bg-remove',
+      component: () => import('@/views/ToolsBgRemoveView.vue'),
+    },
+    {
+      path: '/tools/image-edit',
+      name: 'tools-image-edit',
+      component: () => import('@/views/ToolsImageEditView.vue'),
+    },
     {
       path: '/licenses',
       name: 'licenses',

packages/frontend/src/styles.css

@@ -10,8 +10,10 @@
   --card: #ffffff;
   --card-hover: #f5f5f5;
   --danger: #c62828;
-  --font-sans: 'IBM Plex Sans KR', 'Apple SD Gothic Neo', sans-serif;
+  --font-sans: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont,
-  --font-display: 'IBM Plex Sans KR', 'Apple SD Gothic Neo', sans-serif;
+    system-ui, 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
+  --font-display: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont,
+    system-ui, 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
   color-scheme: light;
 }
 

packages/frontend/src/views/CadViewerView.vue

@@ -14,6 +14,7 @@ import {
 } from '@mlightcad/cad-simple-viewer';
 import AppShell from '@/components/AppShell.vue';
 import EditorToolbar from '@/components/EditorToolbar.vue';
+import { useFileDropZone } from '@/composables/useFileDropZone';
 import { consumeViewerFiles } from '@/composables/viewerSession';
 import { usePageTitle } from '@/composables/usePageTitle';
 import { useSystemTheme } from '@/composables/useSystemTheme';
@@ -38,7 +39,7 @@ const error = ref('');
 const notice = ref('');
 const theme = useSystemTheme();
 
-usePageTitle(filename);
+usePageTitle(filename, { faviconKind: 'cad' });
 
 const settings = AcApSettingManager.instance;
 settings.set('isShowCommandLine', false);
@@ -52,7 +53,12 @@ settings.set('isShowToolbar', true);
 
 function applyFiles(files: File[]) {
   const file = files.find((item) => /\.(?:dxf|dwg)$/i.test(item.name));
-  if (!file) return;
+  if (!file) {
+    if (files.length) {
+      error.value = '.dxf 또는 .dwg 파일을 선택해 주세요.';
+    }
+    return;
+  }
   pendingFile.value = file;
   if (fontReady.value) localFile.value = file;
   filename.value = file.name;
@@ -63,6 +69,14 @@ function applyFiles(files: File[]) {
       : '';
 }
 
+const {
+  dropActive,
+  onDragEnter,
+  onDragOver,
+  onDragLeave,
+  onDrop,
+} = useFileDropZone(applyFiles);
+
 async function initialize() {
   applyFiles(consumeViewerFiles('cad'));
   try {
@@ -98,10 +112,6 @@ function onFileSelected(event: Event) {
   const files = Array.from(input.files ?? []);
   input.value = '';
   if (!files.length) return;
-  if (!files.some((file) => /\.(?:dxf|dwg)$/i.test(file.name))) {
-    error.value = '.dxf 또는 .dwg 파일을 선택해 주세요.';
-    return;
-  }
   applyFiles(files);
   void nextTick();
 }
@@ -126,7 +136,14 @@ function onClose() {
 
 <template>
   <AppShell :editor="true">
-    <div class="cad-page">
+    <div
+      class="cad-page"
+      :class="{ 'is-drop-active': dropActive }"
+      @dragenter="onDragEnter"
+      @dragover="onDragOver"
+      @dragleave="onDragLeave"
+      @drop="onDrop"
+    >
       <EditorToolbar
         :filename="filename"
         :show-save="false"
@@ -160,9 +177,15 @@ function onClose() {
         />
         <div v-if="ready && !localFile && viewerCreated" class="empty-state">
           <strong>CAD 도면을 선택해 주세요.</strong>
-          <span>DXF와 DWG 파일은 브라우저 안에서만 처리됩니다.</span>
+          <span>
+            DXF와 DWG 파일을 열거나 이 영역으로 끌어다 놓으세요. 처리는
+            브라우저 안에서만 이뤄집니다.
+          </span>
           <button type="button" @click="onOpen">파일 열기</button>
         </div>
+        <div v-if="dropActive" class="drop-overlay" aria-hidden="true">
+          DXF · DWG 파일을 놓으세요
+        </div>
       </div>
     </div>
   </AppShell>
@@ -231,6 +254,20 @@ function onClose() {
   cursor: pointer;
 }
 
+.drop-overlay {
+  position: absolute;
+  inset: 0.75rem;
+  z-index: 30;
+  display: grid;
+  place-items: center;
+  border: 2px dashed var(--accent);
+  border-radius: 8px;
+  background: color-mix(in srgb, var(--accent-soft) 88%, transparent);
+  color: var(--ink);
+  font-weight: 650;
+  pointer-events: none;
+}
+
 .sr-only {
   position: absolute;
   width: 1px;

packages/frontend/src/views/DrawioEditorView.vue

@@ -154,7 +154,6 @@ function onClose() {
     <div class="editor-page">
       <EditorToolbar
         :filename="filename"
-        save-label="원본 저장"
         :show-export-actions="true"
         :show-filename="false"
         :busy="busy || !ready"

packages/frontend/src/views/ExcalidrawEditorView.vue

@@ -135,7 +135,6 @@ function onClose() {
     <div class="editor-page">
       <EditorToolbar
         :filename="filename"
-        save-label="원본 저장"
         :show-export-actions="true"
         :busy="busy"
         @open="onOpen"

packages/frontend/src/views/HomeView.vue

@@ -60,6 +60,24 @@ const viewerTypes = [
     title: '3D 모델',
     subtitle: 'glTF · OBJ · STEP · IFC · STL · 3DM 등',
   },
+  {
+    route: 'illustrator-viewer',
+    extension: 'ai',
+    title: '일러스트',
+    subtitle: 'Adobe Illustrator (.ai, PDF 호환)',
+  },
+  {
+    route: 'photoshop-viewer',
+    extension: 'psd',
+    title: '포토샵',
+    subtitle: 'Adobe Photoshop (.psd, RGB 8bit)',
+  },
+  {
+    route: 'markdown-viewer',
+    extension: 'md',
+    title: '마크다운',
+    subtitle: '.md · 입력 미리보기',
+  },
 ] as const;
 
 const toolTypes = [
@@ -69,6 +87,18 @@ const toolTypes = [
     title: '문서 스캐너',
     subtitle: '코너 보정 · OCR · PDF',
   },
+  {
+    route: 'tools-bg-remove',
+    extension: 'bgremove',
+    title: '배경 제거',
+    subtitle: '로고 단색 배경 · 투명 PNG',
+  },
+  {
+    route: 'tools-image-edit',
+    extension: 'imgedit',
+    title: '이미지 편집',
+    subtitle: '크롭 · 축소 · 경량화 · 비율',
+  },
 ] as const;
 
 function onDrop(e: DragEvent) {
@@ -116,7 +146,7 @@ function onOpenTool(route: string) {
           <input
             class="drop__input"
             type="file"
-            accept=".docx,.xlsx,.pptx,.pdf,.hwp,.hwpx,.odt,.ods,.odp,.doc,.xls,.ppt,.rtf,.txt,.csv,.excalidraw,.mmd,.mermaid,.drawio,.xml,.dxf,.dwg,.3dm,.3ds,.3mf,.amf,.bim,.brp,.brep,.dae,.fbx,.fcstd,.gltf,.glb,.ifc,.igs,.iges,.stp,.step,.stl,.obj,.off,.ply,.wrl,.zip,.bin,.mtl,.png,.jpg,.jpeg,.webp"
+            accept=".docx,.xlsx,.pptx,.pdf,.hwp,.hwpx,.odt,.ods,.odp,.doc,.xls,.ppt,.rtf,.txt,.csv,.excalidraw,.mmd,.mermaid,.drawio,.xml,.dxf,.dwg,.ai,.psd,.md,.markdown,.3dm,.3ds,.3mf,.amf,.bim,.brp,.brep,.dae,.fbx,.fcstd,.gltf,.glb,.ifc,.igs,.iges,.stp,.step,.stl,.obj,.off,.ply,.wrl,.zip,.bin,.mtl,.png,.jpg,.jpeg,.webp,.ico"
             multiple
             :disabled="busy"
             @change="onInput"
@@ -125,7 +155,7 @@ function onOpenTool(route: string) {
             {{ busy ? '여는 중…' : '파일을 끌어다 놓거나 클릭하여 선택' }}
           </span>
           <span class="drop__hint">
-            오피스·PDF · HWP/HWPX · 다이어그램 · CAD · 3D · 이미지(스캐너)
+            오피스·PDF · HWP/HWPX · 다이어그램 · CAD · 3D · 일러스트(.ai) · 포토샵(.psd) · 마크다운(.md) · 이미지(스캐너) · 아이콘(.ico)
           </span>
         </label>
 
@@ -179,10 +209,11 @@ function onOpenTool(route: string) {
       </section>
 
       <section class="section">
-        <h2 class="section__title">CAD·3D 모델</h2>
+        <h2 class="section__title">뷰어</h2>
         <p class="section__lead">
-          서버 업로드 없이 도면과 모델을 조회합니다. 텍스처·MTL·BIN 등 보조
+          서버 업로드 없이 도면·모델·일러스트·포토샵·마크다운을 조회합니다. 텍스처·MTL·BIN
-          파일이나 ZIP은 원본과 함께 선택하세요.
+          등 보조 파일이나 ZIP은 원본과 함께 선택하세요. .ai는 PDF 호환, .psd는
+          RGB·8bit만 안정적으로 열립니다.
         </p>
 
         <div class="grid">
@@ -206,7 +237,7 @@ function onOpenTool(route: string) {
       <section class="section">
         <h2 class="section__title">도구</h2>
         <p class="section__lead">
-          브라우저에서 문서를 스캔·보정하고 OCR이 포함된 PDF로 저장합니다.
+          브라우저에서 문서를 스캔하고, 배경을 제거하며, 이미지를 크롭·축소·경량화합니다.
         </p>
 
         <div class="grid">
@@ -358,6 +389,11 @@ function onOpenTool(route: string) {
     border-color 0.15s ease;
 }
 
+.tile :deep(.ft-icon) {
+  width: 36px;
+  height: 36px;
+}
+
 .tile:hover:not(:disabled) {
   background: var(--card-hover);
   border-color: color-mix(in srgb, var(--accent) 40%, var(--border));

packages/frontend/src/views/IllustratorViewerView.vue

@@ -0,0 +1,476 @@
+<script setup lang="ts">
+import {
+  computed,
+  nextTick,
+  onActivated,
+  onBeforeUnmount,
+  onMounted,
+  ref,
+  watch,
+} from 'vue';
+import { useRouter } from 'vue-router';
+import type { PDFDocumentProxy } from 'pdfjs-dist';
+import AppShell from '@/components/AppShell.vue';
+import EditorToolbar from '@/components/EditorToolbar.vue';
+import { useFileDropZone } from '@/composables/useFileDropZone';
+import { consumeViewerFiles } from '@/composables/viewerSession';
+import { usePageTitle } from '@/composables/usePageTitle';
+import {
+  AI_INCOMPATIBLE_MESSAGE,
+  cancelAiRender,
+  isAiFile,
+  isAiRenderCancelled,
+  openAiAsPdf,
+  renderAiPage,
+} from '@/integrations/illustrator/loadAi';
+
+defineOptions({ name: 'IllustratorViewerView' });
+
+const router = useRouter();
+const fileInput = ref<HTMLInputElement | null>(null);
+const canvasRef = ref<HTMLCanvasElement | null>(null);
+const stageRef = ref<HTMLElement | null>(null);
+const filename = ref('일러스트');
+const error = ref('');
+const notice = ref('');
+const busy = ref(false);
+const page = ref(1);
+const pageCount = ref(0);
+const zoom = ref(1);
+const fitZoom = ref(1);
+
+let pdfDoc: PDFDocumentProxy | null = null;
+let renderSeq = 0;
+
+usePageTitle(filename, { faviconKind: 'illustrator' });
+
+const pageLabel = computed(() =>
+  pageCount.value > 0 ? `${page.value} / ${pageCount.value}` : '—',
+);
+
+const zoomLabel = computed(() => `${Math.round(zoom.value * 100)}%`);
+
+async function disposePdf() {
+  renderSeq += 1;
+  await cancelAiRender();
+  if (pdfDoc) {
+    try {
+      await pdfDoc.cleanup();
+    } catch {
+      /* ignore */
+    }
+    pdfDoc = null;
+  }
+  pageCount.value = 0;
+  page.value = 1;
+}
+
+async function paint() {
+  const canvas = canvasRef.value;
+  if (!pdfDoc || !canvas || pageCount.value < 1) return;
+  const seq = ++renderSeq;
+  // Coalesce rapid page/zoom updates onto the latest request.
+  await Promise.resolve();
+  if (seq !== renderSeq) return;
+
+  busy.value = true;
+  try {
+    await renderAiPage(pdfDoc, page.value, canvas, zoom.value);
+    if (seq !== renderSeq) return;
+    error.value = '';
+  } catch (reason) {
+    if (seq !== renderSeq || isAiRenderCancelled(reason)) return;
+    error.value =
+      reason instanceof Error ? reason.message : '페이지를 그리지 못했습니다.';
+  } finally {
+    if (seq === renderSeq) busy.value = false;
+  }
+}
+
+async function updateFitZoom() {
+  if (!pdfDoc || !stageRef.value) return;
+  try {
+    const p = await pdfDoc.getPage(page.value);
+    const viewport = p.getViewport({ scale: 1 });
+    p.cleanup();
+    const pad = 32;
+    const availW = Math.max(120, stageRef.value.clientWidth - pad);
+    const availH = Math.max(120, stageRef.value.clientHeight - pad);
+    const sx = availW / viewport.width;
+    const sy = availH / viewport.height;
+    fitZoom.value = Math.max(0.1, Math.min(sx, sy, 4));
+  } catch {
+    fitZoom.value = 1;
+  }
+}
+
+async function loadFile(file: File) {
+  if (!isAiFile(file)) {
+    error.value = '.ai 파일을 선택해 주세요.';
+    return;
+  }
+  busy.value = true;
+  error.value = '';
+  notice.value = '';
+  filename.value = file.name;
+  await disposePdf();
+  try {
+    const data = await file.arrayBuffer();
+    pdfDoc = await openAiAsPdf(data);
+    pageCount.value = pdfDoc.numPages;
+    page.value = 1;
+    await nextTick();
+    await updateFitZoom();
+    zoom.value = fitZoom.value;
+    await paint();
+    if (pdfDoc.numPages > 1) {
+      notice.value = `아트보드(페이지) ${pdfDoc.numPages}개`;
+    }
+  } catch (reason) {
+    error.value =
+      reason instanceof Error ? reason.message : AI_INCOMPATIBLE_MESSAGE;
+    await disposePdf();
+  } finally {
+    busy.value = false;
+  }
+}
+
+function applyFiles(files: File[]) {
+  const file = files.find((item) => isAiFile(item));
+  if (!file) {
+    if (files.length) error.value = '.ai 파일을 선택해 주세요.';
+    return;
+  }
+  void loadFile(file);
+}
+
+const {
+  dropActive,
+  onDragEnter,
+  onDragOver,
+  onDragLeave,
+  onDrop,
+} = useFileDropZone(applyFiles);
+
+onMounted(() => {
+  applyFiles(consumeViewerFiles('illustrator'));
+});
+
+onActivated(() => {
+  const files = consumeViewerFiles('illustrator');
+  if (files.length) applyFiles(files);
+});
+
+onBeforeUnmount(() => {
+  void disposePdf();
+});
+
+watch([page, zoom], () => {
+  if (!pdfDoc || pageCount.value < 1) return;
+  void paint();
+});
+
+function onOpen() {
+  fileInput.value?.click();
+}
+
+function onFileSelected(event: Event) {
+  const input = event.target as HTMLInputElement;
+  const files = Array.from(input.files ?? []);
+  input.value = '';
+  if (files.length) applyFiles(files);
+}
+
+function onClose() {
+  void router.push({ name: 'home' });
+}
+
+function zoomBy(factor: number) {
+  zoom.value = Math.min(4, Math.max(0.1, Math.round(zoom.value * factor * 100) / 100));
+}
+
+async function zoomFit() {
+  await updateFitZoom();
+  zoom.value = fitZoom.value;
+}
+
+function zoomReset() {
+  zoom.value = 1;
+}
+
+function prevPage() {
+  if (page.value > 1) page.value -= 1;
+}
+
+function nextPage() {
+  if (page.value < pageCount.value) page.value += 1;
+}
+</script>
+
+<template>
+  <AppShell :editor="true">
+    <div
+      class="ai-page"
+      :class="{ 'is-drop-active': dropActive }"
+      @dragenter="onDragEnter"
+      @dragover="onDragOver"
+      @dragleave="onDragLeave"
+      @drop="onDrop"
+    >
+      <EditorToolbar
+        :filename="filename"
+        :show-save="false"
+        :busy="busy"
+        @open="onOpen"
+        @close="onClose"
+      />
+      <input
+        ref="fileInput"
+        class="sr-only"
+        type="file"
+        accept=".ai,application/postscript"
+        @change="onFileSelected"
+      />
+
+      <div v-if="pageCount > 0" class="ai-controls">
+        <div class="ai-controls__group">
+          <button
+            type="button"
+            class="ai-btn"
+            :disabled="page <= 1 || busy"
+            @click="prevPage"
+          >
+            이전
+          </button>
+          <span class="ai-controls__label">{{ pageLabel }}</span>
+          <button
+            type="button"
+            class="ai-btn"
+            :disabled="page >= pageCount || busy"
+            @click="nextPage"
+          >
+            다음
+          </button>
+        </div>
+        <div class="ai-controls__group">
+          <button type="button" class="ai-btn" :disabled="busy" @click="zoomBy(1 / 1.25)">
+            −
+          </button>
+          <span class="ai-controls__label">{{ zoomLabel }}</span>
+          <button type="button" class="ai-btn" :disabled="busy" @click="zoomBy(1.25)">
+            +
+          </button>
+          <button type="button" class="ai-btn" :disabled="busy" @click="zoomFit">
+            맞춤
+          </button>
+          <button type="button" class="ai-btn" :disabled="busy" @click="zoomReset">
+            100%
+          </button>
+        </div>
+      </div>
+
+      <p v-if="error" class="viewer-message viewer-message--error" role="alert">
+        {{ error }}
+      </p>
+      <p v-else-if="notice" class="viewer-message">{{ notice }}</p>
+
+      <div ref="stageRef" class="ai-stage">
+        <canvas
+          v-show="pageCount > 0 && !error"
+          ref="canvasRef"
+          class="ai-canvas"
+        />
+        <div v-if="!pageCount && !error && !busy" class="empty-state">
+          <strong>Illustrator (.ai) 파일을 선택해 주세요.</strong>
+          <span>
+            PDF 호환으로 저장된 .ai만 브라우저에서 볼 수 있습니다. 파일을 열거나
+            이 영역으로 끌어다 놓으세요.
+          </span>
+          <button type="button" @click="onOpen">파일 열기</button>
+        </div>
+        <div v-if="dropActive" class="drop-overlay" aria-hidden="true">
+          .ai 파일을 놓으세요
+        </div>
+      </div>
+    </div>
+  </AppShell>
+</template>
+
+<style scoped>
+.ai-page {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  height: 100%;
+  background: var(--canvas);
+  position: relative;
+}
+
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
+.ai-controls {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.65rem;
+  padding: 0.45rem 0.85rem;
+  border-bottom: 1px solid var(--border);
+  background: var(--surface);
+}
+
+.ai-controls__group {
+  display: flex;
+  align-items: center;
+  gap: 0.4rem;
+}
+
+.ai-controls__label {
+  min-width: 3.5rem;
+  text-align: center;
+  font-size: 0.82rem;
+  font-variant-numeric: tabular-nums;
+  color: var(--ink-soft);
+}
+
+.ai-btn {
+  font: inherit;
+  font-size: 0.8rem;
+  font-weight: 600;
+  padding: 0.28rem 0.65rem;
+  border-radius: 6px;
+  border: 1px solid var(--border);
+  background: var(--card);
+  color: var(--ink);
+  cursor: pointer;
+}
+
+.ai-btn:hover:not(:disabled) {
+  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
+  background: var(--card-hover);
+}
+
+.ai-btn:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.viewer-message {
+  margin: 0;
+  padding: 0.45rem 0.85rem;
+  font-size: 0.82rem;
+  color: var(--ink-soft);
+  border-bottom: 1px solid var(--border);
+  background: var(--surface);
+}
+
+.viewer-message--error {
+  color: var(--danger);
+  background: color-mix(in srgb, var(--danger) 10%, var(--surface));
+}
+
+.ai-stage {
+  flex: 1;
+  min-height: 0;
+  position: relative;
+  overflow: auto;
+  display: grid;
+  place-items: center;
+  padding: 1rem;
+  background:
+    linear-gradient(45deg, #ececec 25%, transparent 25%),
+    linear-gradient(-45deg, #ececec 25%, transparent 25%),
+    linear-gradient(45deg, transparent 75%, #ececec 75%),
+    linear-gradient(-45deg, transparent 75%, #ececec 75%);
+  background-size: 16px 16px;
+  background-position:
+    0 0,
+    0 8px,
+    8px -8px,
+    -8px 0;
+  background-color: #f7f7f7;
+}
+
+@media (prefers-color-scheme: dark) {
+  .ai-stage {
+    background-color: #1a1a1a;
+    background-image:
+      linear-gradient(45deg, #242424 25%, transparent 25%),
+      linear-gradient(-45deg, #242424 25%, transparent 25%),
+      linear-gradient(45deg, transparent 75%, #242424 75%),
+      linear-gradient(-45deg, transparent 75%, #242424 75%);
+  }
+}
+
+.ai-canvas {
+  display: block;
+  max-width: none;
+  box-shadow: 0 4px 24px rgb(0 0 0 / 18%);
+  background: #fff;
+}
+
+.empty-state {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 0.55rem;
+  max-width: 28rem;
+  padding: 1.25rem 1.35rem;
+  border-radius: 10px;
+  border: 1px solid var(--border);
+  background: var(--surface);
+  color: var(--ink);
+}
+
+.empty-state strong {
+  font-size: 1rem;
+}
+
+.empty-state span {
+  font-size: 0.88rem;
+  color: var(--muted);
+  line-height: 1.45;
+}
+
+.empty-state button {
+  font: inherit;
+  font-size: 0.86rem;
+  font-weight: 600;
+  margin-top: 0.25rem;
+  padding: 0.4rem 0.85rem;
+  border: none;
+  border-radius: 6px;
+  background: var(--accent);
+  color: #fff;
+  cursor: pointer;
+}
+
+.drop-overlay {
+  position: absolute;
+  inset: 0;
+  display: grid;
+  place-items: center;
+  background: color-mix(in srgb, var(--accent) 22%, transparent);
+  color: var(--ink);
+  font-weight: 650;
+  font-size: 1.05rem;
+  pointer-events: none;
+  z-index: 2;
+}
+
+.ai-page.is-drop-active .ai-stage {
+  outline: 2px dashed var(--accent);
+  outline-offset: -8px;
+}
+</style>

packages/frontend/src/views/LicensesView.vue

@@ -20,6 +20,16 @@ const thirdParty = [
     license: 'MIT',
     url: 'https://github.com/mermaid-js/mermaid',
   },
+  {
+    name: 'marked',
+    license: 'MIT',
+    url: 'https://github.com/markedjs/marked',
+  },
+  {
+    name: 'DOMPurify',
+    license: 'MPL-2.0 OR Apache-2.0',
+    url: 'https://github.com/cure53/DOMPurify',
+  },
   { name: 'Three.js', license: 'MIT', url: 'https://github.com/mrdoob/three.js' },
   {
     name: 'Online 3D Viewer',
@@ -86,6 +96,11 @@ const thirdParty = [
     license: 'Apache-2.0',
     url: 'https://github.com/mozilla/pdf.js',
   },
+  {
+    name: 'Pretendard',
+    license: 'SIL OFL 1.1',
+    url: 'https://github.com/orioncactus/pretendard',
+  },
   {
     name: 'Noto Sans KR',
     license: 'SIL OFL 1.1',

packages/frontend/src/views/MarkdownViewerView.vue

@@ -0,0 +1,357 @@
+<script setup lang="ts">
+import { computed, onActivated, onMounted, ref, watch } from 'vue';
+import { useRouter } from 'vue-router';
+import AppShell from '@/components/AppShell.vue';
+import EditorToolbar from '@/components/EditorToolbar.vue';
+import { useFileDropZone } from '@/composables/useFileDropZone';
+import { consumeViewerFiles } from '@/composables/viewerSession';
+import { usePageTitle } from '@/composables/usePageTitle';
+import {
+  isMarkdownFile,
+  renderMarkdown,
+} from '@/integrations/markdown/render';
+import { downloadText, readTextFile } from '@/utils/downloadBlob';
+
+defineOptions({ name: 'MarkdownViewerView' });
+
+const DEFAULT_SOURCE = `# 마크다운
+
+왼쪽 칸에 입력하거나 \`.md\` 파일을 열면 미리보기가 표시됩니다.
+
+- **굵게** · *기울임* · \`코드\`
+- [링크](https://git.sejong.dev)
+
+\`\`\`ts
+console.log('hello');
+\`\`\`
+`;
+
+const router = useRouter();
+const fileInput = ref<HTMLInputElement | null>(null);
+const filename = ref('미리보기.md');
+const source = ref(DEFAULT_SOURCE);
+const error = ref('');
+const busy = ref(false);
+
+usePageTitle(filename, { faviconKind: 'markdown' });
+
+const html = computed(() => renderMarkdown(source.value));
+
+function onClose() {
+  void router.push({ name: 'home' });
+}
+
+function onOpen() {
+  fileInput.value?.click();
+}
+
+function onSave() {
+  downloadText(source.value, filename.value, 'text/markdown;charset=utf-8');
+}
+
+async function loadFile(file: File) {
+  if (!isMarkdownFile(file)) {
+    error.value = '.md 또는 .markdown 파일을 선택해 주세요.';
+    return;
+  }
+  busy.value = true;
+  error.value = '';
+  try {
+    source.value = await readTextFile(file);
+    filename.value = file.name.replace(/\.markdown$/i, '.md');
+  } catch (reason) {
+    error.value =
+      reason instanceof Error ? reason.message : '파일을 열지 못했습니다.';
+  } finally {
+    busy.value = false;
+  }
+}
+
+function onFileSelected(event: Event) {
+  const input = event.target as HTMLInputElement;
+  const file = input.files?.[0];
+  input.value = '';
+  if (file) void loadFile(file);
+}
+
+function consumePending() {
+  const [file] = consumeViewerFiles('markdown');
+  if (file) void loadFile(file);
+}
+
+onMounted(consumePending);
+onActivated(consumePending);
+
+const {
+  dropActive,
+  onDragEnter,
+  onDragOver,
+  onDragLeave,
+  onDrop: onZoneDrop,
+} = useFileDropZone((files) => {
+  const file = files[0];
+  if (file) void loadFile(file);
+});
+
+watch(source, () => {
+  if (error.value && source.value) error.value = '';
+});
+</script>
+
+<template>
+  <AppShell :editor="true">
+    <div
+      class="md-page"
+      :class="{ 'is-drop-active': dropActive }"
+      @dragenter="onDragEnter"
+      @dragover="onDragOver"
+      @dragleave="onDragLeave"
+      @drop="onZoneDrop"
+    >
+      <EditorToolbar
+        :filename="filename"
+        :busy="busy"
+        save-label="다운로드"
+        @open="onOpen"
+        @save="onSave"
+        @close="onClose"
+      />
+      <input
+        ref="fileInput"
+        class="sr-only"
+        type="file"
+        accept=".md,.markdown,.mdown,text/markdown,text/plain"
+        @change="onFileSelected"
+      />
+      <p v-if="error" class="viewer-message viewer-message--error" role="alert">
+        {{ error }}
+      </p>
+
+      <div class="md-layout">
+        <section class="source-pane" aria-label="마크다운 입력">
+          <textarea
+            v-model="source"
+            class="source"
+            spellcheck="false"
+            :disabled="busy"
+            aria-label="마크다운 원문"
+            placeholder="# 제목&#10;&#10;여기에 마크다운을 입력하세요."
+          />
+        </section>
+        <section class="preview-pane" aria-label="마크다운 미리보기">
+          <article class="preview" v-html="html" />
+        </section>
+      </div>
+
+      <div v-if="dropActive" class="drop-overlay" aria-hidden="true">
+        마크다운 파일을 놓아 열기
+      </div>
+    </div>
+  </AppShell>
+</template>
+
+<style scoped>
+.md-page {
+  position: relative;
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  height: 100%;
+  background: var(--canvas);
+}
+
+.md-layout {
+  flex: 1 1 auto;
+  min-height: 0;
+  display: grid;
+  grid-template-columns: minmax(16rem, 1fr) minmax(0, 1.15fr);
+  gap: 1px;
+  background: var(--border);
+}
+
+.source-pane,
+.preview-pane {
+  min-width: 0;
+  min-height: 0;
+  background: var(--surface);
+}
+
+.source {
+  display: block;
+  width: 100%;
+  height: 100%;
+  resize: none;
+  border: 0;
+  outline: 0;
+  padding: 1rem;
+  background: var(--surface);
+  color: var(--ink);
+  font: 0.9rem/1.55 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
+  tab-size: 2;
+}
+
+.preview-pane {
+  overflow: auto;
+  padding: 1.25rem 1.4rem 2rem;
+}
+
+.preview {
+  max-width: 46rem;
+  color: var(--ink);
+  font-size: 0.95rem;
+  line-height: 1.65;
+  word-break: break-word;
+}
+
+.preview :deep(:first-child) {
+  margin-top: 0;
+}
+
+.preview :deep(h1),
+.preview :deep(h2),
+.preview :deep(h3),
+.preview :deep(h4) {
+  margin: 1.35em 0 0.5em;
+  line-height: 1.3;
+  font-weight: 650;
+}
+
+.preview :deep(h1) {
+  font-size: 1.7rem;
+  padding-bottom: 0.3em;
+  border-bottom: 1px solid var(--border);
+}
+
+.preview :deep(h2) {
+  font-size: 1.3rem;
+  padding-bottom: 0.25em;
+  border-bottom: 1px solid var(--border);
+}
+
+.preview :deep(h3) {
+  font-size: 1.1rem;
+}
+
+.preview :deep(p),
+.preview :deep(ul),
+.preview :deep(ol),
+.preview :deep(blockquote),
+.preview :deep(pre),
+.preview :deep(table) {
+  margin: 0 0 1em;
+}
+
+.preview :deep(ul),
+.preview :deep(ol) {
+  padding-left: 1.4em;
+}
+
+.preview :deep(a) {
+  color: var(--accent);
+}
+
+.preview :deep(code) {
+  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
+  font-size: 0.86em;
+  padding: 0.12em 0.35em;
+  border-radius: 4px;
+  background: var(--canvas);
+}
+
+.preview :deep(pre) {
+  overflow: auto;
+  padding: 0.85rem 1rem;
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  background: var(--canvas);
+}
+
+.preview :deep(pre code) {
+  padding: 0;
+  background: none;
+}
+
+.preview :deep(blockquote) {
+  padding: 0 0.85rem;
+  border-left: 3px solid var(--accent);
+  color: var(--muted);
+}
+
+.preview :deep(hr) {
+  border: 0;
+  border-top: 1px solid var(--border);
+  margin: 1.4em 0;
+}
+
+.preview :deep(img) {
+  max-width: 100%;
+  height: auto;
+}
+
+.preview :deep(table) {
+  display: block;
+  width: max-content;
+  max-width: 100%;
+  overflow: auto;
+  border-collapse: collapse;
+}
+
+.preview :deep(th),
+.preview :deep(td) {
+  padding: 0.4rem 0.65rem;
+  border: 1px solid var(--border);
+}
+
+.preview :deep(th) {
+  background: var(--canvas);
+  text-align: left;
+}
+
+.drop-overlay {
+  position: absolute;
+  inset: 2.75rem 0.5rem 0.5rem;
+  z-index: 20;
+  display: grid;
+  place-items: center;
+  border: 2px dashed var(--accent);
+  border-radius: 8px;
+  background: color-mix(in srgb, var(--accent-soft) 88%, transparent);
+  color: var(--ink);
+  font-weight: 650;
+  pointer-events: none;
+}
+
+.viewer-message {
+  margin: 0;
+  padding: 0.45rem 0.85rem;
+  border-bottom: 1px solid var(--border);
+  background: var(--surface);
+  color: var(--ink);
+  font-size: 0.86rem;
+}
+
+.viewer-message--error {
+  color: #b42318;
+  background: color-mix(in srgb, #b42318 10%, var(--surface));
+}
+
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
+@media (max-width: 760px) {
+  .md-layout {
+    grid-template-columns: 1fr;
+    grid-template-rows: minmax(12rem, 0.85fr) minmax(14rem, 1fr);
+  }
+}
+</style>

packages/frontend/src/views/MermaidEditorView.vue

@@ -58,7 +58,7 @@ async function renderDiagram() {
       startOnLoad: false,
       securityLevel: 'strict',
       theme: theme.value === 'dark' ? 'dark' : 'default',
-      fontFamily: 'IBM Plex Sans KR, sans-serif',
+      fontFamily: 'Pretendard Variable, Pretendard, sans-serif',
       htmlLabels: false,
     });
     await mermaid.parse(code.value);
@@ -176,7 +176,6 @@ function onClose() {
     <div class="editor-page">
       <EditorToolbar
         :filename="filename"
-        save-label="원본 저장"
         :show-export-actions="true"
         :busy="busy"
         @open="onOpen"

packages/frontend/src/views/Model3DViewerView.vue

@@ -13,6 +13,7 @@ import Model3DCanvas from '@/components/model3d/Model3DCanvas.vue';
 import ModelTreeItem from '@/components/model3d/ModelTreeItem.vue';
 import { MODEL3D_EXTENSIONS } from '@/config/app';
 import { consumeViewerFiles } from '@/composables/viewerSession';
+import { useFileDropZone } from '@/composables/useFileDropZone';
 import { usePageTitle } from '@/composables/usePageTitle';
 import { useSystemTheme } from '@/composables/useSystemTheme';
 import {
@@ -84,7 +85,7 @@ const propertyGroups = computed(() =>
   selectedKey.value ? selectionGroups.value : modelGroups.value,
 );
 
-usePageTitle(filename);
+usePageTitle(filename, { faviconKind: 'model3d' });
 
 function applyFiles(nextFiles: File[]) {
   const primary = findPrimaryModelFile(nextFiles);
@@ -135,10 +136,18 @@ function onFilesSelected(event: Event) {
   if (selected.length) applyFiles(selected);
 }
 
+const {
+  dropActive,
+  onDragEnter,
+  onDragOver,
+  onDragLeave,
+  onDrop,
+} = useFileDropZone(applyFiles);
+
 function onProgress(value: number, label: string) {
-  loading.value = true;
   progress.value = value;
   progressLabel.value = label;
+  if (value < 1) loading.value = true;
 }
 
 function onLoaded(
@@ -238,10 +247,16 @@ function onClose() {
 
 <template>
   <AppShell :editor="true">
-    <div class="model-page">
+    <div
+      class="model-page"
+      :class="{ 'is-drop-active': dropActive }"
+      @dragenter="onDragEnter"
+      @dragover="onDragOver"
+      @dragleave="onDragLeave"
+      @drop="onDrop"
+    >
       <EditorToolbar
         :filename="filename"
-        save-label="내보내기"
         :show-save="Boolean(stats)"
         :busy="loading || exportBusy"
         @open="onOpen"
@@ -314,8 +329,9 @@ function onClose() {
           <div v-else class="empty-state">
             <strong>3D 모델을 선택해 주세요.</strong>
             <span>
-              Online3DViewer가 지원하는 형식과 ZIP, 보조 텍스처를 함께 열 수
+              Online3DViewer가 지원하는 형식과 ZIP, 보조 텍스처를 함께 열거나
-              있습니다.
+              이 영역으로 끌어다 놓을 수 있습니다. 면 없는 PLY는 포인트
+              클라우드로 표시됩니다.
             </span>
             <button type="button" @click="onOpen">파일 열기</button>
           </div>
@@ -369,6 +385,10 @@ function onClose() {
             <progress :value="progressPercent" max="100" />
             <small>{{ progressPercent }}%</small>
           </div>
+
+          <div v-if="dropActive" class="drop-overlay" aria-hidden="true">
+            3D 모델 파일을 놓으세요
+          </div>
         </main>
 
         <aside class="inspector">
@@ -632,6 +652,20 @@ function onClose() {
   text-align: right;
 }
 
+.drop-overlay {
+  position: absolute;
+  inset: 0.75rem;
+  z-index: 25;
+  display: grid;
+  place-items: center;
+  border: 2px dashed var(--accent);
+  border-radius: 8px;
+  background: color-mix(in srgb, var(--accent-soft) 88%, transparent);
+  color: var(--ink);
+  font-weight: 650;
+  pointer-events: none;
+}
+
 .export-bar {
   display: flex;
   flex-wrap: wrap;

packages/frontend/src/views/OnlyOfficeEditorView.vue

@@ -2,9 +2,10 @@
 import { nextTick, onActivated, onMounted, onUnmounted, ref } from 'vue';
 import { useRoute, useRouter } from 'vue-router';
 import AppShell from '@/components/AppShell.vue';
+import DownloadGuideModal from '@/components/DownloadGuideModal.vue';
 import EditorErrorState from '@/components/EditorErrorState.vue';
 import EditorToolbar from '@/components/EditorToolbar.vue';
-import { downloadDocumentUrl, fetchEditorConfig } from '@/api/client';
+import { fetchEditorConfig } from '@/api/client';
 import { useOpenDocument } from '@/composables/useOpenDocument';
 import { usePageTitle } from '@/composables/usePageTitle';
 import { useSessionLifecycle } from '@/composables/useSessionLifecycle';
@@ -15,6 +16,7 @@ const route = useRoute();
 const router = useRouter();
 const error = ref<unknown>(null);
 const filename = ref('문서');
+const guideOpen = ref(false);
 const frameHost = ref<HTMLElement | null>(null);
 const fileInput = ref<HTMLInputElement | null>(null);
 let editor: { destroyEditor?: () => void } | null = null;
@@ -27,6 +29,12 @@ const { openDocument } = useOpenDocument();
 usePageTitle(filename);
 useSessionLifecycle({ enableHeartbeat: true });
 
+const downloadGuideSteps = [
+  '편집기 좌측 상단의 파일을 누릅니다.',
+  '다운로드 방법을 선택합니다.',
+  '원하는 확장자를 고르면 파일이 저장됩니다.',
+];
+
 function editorHeightPx(): number {
   const host = frameHost.value;
   if (host) {
@@ -123,15 +131,8 @@ function onFileSelected(e: Event) {
   input.value = '';
 }
 
-function onSave() {
+function onDownload() {
-  const docId = route.params.docId as string;
+  guideOpen.value = true;
-  const a = document.createElement('a');
-  a.href = downloadDocumentUrl(docId);
-  a.download = filename.value;
-  a.rel = 'noopener';
-  document.body.appendChild(a);
-  a.click();
-  a.remove();
 }
 
 function onClose() {
@@ -147,7 +148,7 @@ function onClose() {
         :filename="filename"
         :show-filename="false"
         @open="onOpen"
-        @save="onSave"
+        @save="onDownload"
         @close="onClose"
       />
       <input
@@ -162,6 +163,14 @@ function onClose() {
       <div v-show="!error" ref="frameHost" class="editor-frame">
         <div id="onlyoffice-placeholder" class="editor-frame__inner" />
       </div>
+
+      <DownloadGuideModal
+        :open="guideOpen"
+        lead="수정한 파일은 EuroOffice 편집기 메뉴에서 받을 수 있습니다."
+        :steps="downloadGuideSteps"
+        path-hint="파일 → 다운로드 방법 → 확장자 선택"
+        @close="guideOpen = false"
+      />
     </div>
   </AppShell>
 </template>

packages/frontend/src/views/PhotoshopViewerView.vue

@@ -0,0 +1,421 @@
+<script setup lang="ts">
+import {
+  computed,
+  nextTick,
+  onActivated,
+  onBeforeUnmount,
+  onMounted,
+  ref,
+  watch,
+} from 'vue';
+import { useRouter } from 'vue-router';
+import AppShell from '@/components/AppShell.vue';
+import EditorToolbar from '@/components/EditorToolbar.vue';
+import { useFileDropZone } from '@/composables/useFileDropZone';
+import { consumeViewerFiles } from '@/composables/viewerSession';
+import { usePageTitle } from '@/composables/usePageTitle';
+import {
+  drawPsdToCanvas,
+  isPsdFile,
+  openPsd,
+  PSD_INCOMPATIBLE_MESSAGE,
+  type OpenedPsd,
+} from '@/integrations/photoshop/loadPsd';
+
+defineOptions({ name: 'PhotoshopViewerView' });
+
+const router = useRouter();
+const fileInput = ref<HTMLInputElement | null>(null);
+const canvasRef = ref<HTMLCanvasElement | null>(null);
+const stageRef = ref<HTMLElement | null>(null);
+const filename = ref('포토샵');
+const error = ref('');
+const notice = ref('');
+const busy = ref(false);
+const hasImage = ref(false);
+const zoom = ref(1);
+const fitZoom = ref(1);
+
+let opened: OpenedPsd | null = null;
+let renderSeq = 0;
+
+usePageTitle(filename, { faviconKind: 'photoshop' });
+
+const zoomLabel = computed(() => `${Math.round(zoom.value * 100)}%`);
+
+function disposePsd() {
+  renderSeq += 1;
+  opened = null;
+  hasImage.value = false;
+}
+
+function paint() {
+  const canvas = canvasRef.value;
+  if (!opened || !canvas) return;
+  const seq = ++renderSeq;
+  try {
+    drawPsdToCanvas(opened.canvas, canvas, zoom.value);
+    if (seq !== renderSeq) return;
+    error.value = '';
+  } catch (reason) {
+    if (seq !== renderSeq) return;
+    error.value =
+      reason instanceof Error ? reason.message : '이미지를 그리지 못했습니다.';
+  }
+}
+
+function updateFitZoom() {
+  if (!opened || !stageRef.value) {
+    fitZoom.value = 1;
+    return;
+  }
+  const pad = 32;
+  const availW = Math.max(120, stageRef.value.clientWidth - pad);
+  const availH = Math.max(120, stageRef.value.clientHeight - pad);
+  const sx = availW / opened.width;
+  const sy = availH / opened.height;
+  fitZoom.value = Math.max(0.1, Math.min(sx, sy, 4));
+}
+
+async function loadFile(file: File) {
+  if (!isPsdFile(file)) {
+    error.value = '.psd 파일을 선택해 주세요.';
+    return;
+  }
+  busy.value = true;
+  error.value = '';
+  notice.value = '';
+  filename.value = file.name;
+  disposePsd();
+  try {
+    const data = await file.arrayBuffer();
+    opened = openPsd(data);
+    hasImage.value = true;
+    await nextTick();
+    updateFitZoom();
+    zoom.value = fitZoom.value;
+    paint();
+    notice.value = `${opened.width} × ${opened.height}px`;
+  } catch (reason) {
+    error.value =
+      reason instanceof Error ? reason.message : PSD_INCOMPATIBLE_MESSAGE;
+    disposePsd();
+  } finally {
+    busy.value = false;
+  }
+}
+
+function applyFiles(files: File[]) {
+  const file = files.find((item) => isPsdFile(item));
+  if (!file) {
+    if (files.length) error.value = '.psd 파일을 선택해 주세요.';
+    return;
+  }
+  void loadFile(file);
+}
+
+const {
+  dropActive,
+  onDragEnter,
+  onDragOver,
+  onDragLeave,
+  onDrop,
+} = useFileDropZone(applyFiles);
+
+onMounted(() => {
+  applyFiles(consumeViewerFiles('photoshop'));
+});
+
+onActivated(() => {
+  const files = consumeViewerFiles('photoshop');
+  if (files.length) applyFiles(files);
+});
+
+onBeforeUnmount(() => {
+  disposePsd();
+});
+
+watch(zoom, () => {
+  if (!opened) return;
+  paint();
+});
+
+function onOpen() {
+  fileInput.value?.click();
+}
+
+function onFileSelected(event: Event) {
+  const input = event.target as HTMLInputElement;
+  const files = Array.from(input.files ?? []);
+  input.value = '';
+  if (files.length) applyFiles(files);
+}
+
+function onClose() {
+  void router.push({ name: 'home' });
+}
+
+function zoomBy(factor: number) {
+  zoom.value = Math.min(
+    4,
+    Math.max(0.1, Math.round(zoom.value * factor * 100) / 100),
+  );
+}
+
+function zoomFit() {
+  updateFitZoom();
+  zoom.value = fitZoom.value;
+}
+
+function zoomReset() {
+  zoom.value = 1;
+}
+</script>
+
+<template>
+  <AppShell :editor="true">
+    <div
+      class="psd-page"
+      :class="{ 'is-drop-active': dropActive }"
+      @dragenter="onDragEnter"
+      @dragover="onDragOver"
+      @dragleave="onDragLeave"
+      @drop="onDrop"
+    >
+      <EditorToolbar
+        :filename="filename"
+        :show-save="false"
+        :busy="busy"
+        @open="onOpen"
+        @close="onClose"
+      />
+      <input
+        ref="fileInput"
+        class="sr-only"
+        type="file"
+        accept=".psd,image/vnd.adobe.photoshop"
+        @change="onFileSelected"
+      />
+
+      <div v-if="hasImage" class="psd-controls">
+        <div class="psd-controls__group">
+          <button type="button" class="psd-btn" :disabled="busy" @click="zoomBy(1 / 1.25)">
+            −
+          </button>
+          <span class="psd-controls__label">{{ zoomLabel }}</span>
+          <button type="button" class="psd-btn" :disabled="busy" @click="zoomBy(1.25)">
+            +
+          </button>
+          <button type="button" class="psd-btn" :disabled="busy" @click="zoomFit">
+            맞춤
+          </button>
+          <button type="button" class="psd-btn" :disabled="busy" @click="zoomReset">
+            100%
+          </button>
+        </div>
+      </div>
+
+      <p v-if="error" class="viewer-message viewer-message--error" role="alert">
+        {{ error }}
+      </p>
+      <p v-else-if="notice" class="viewer-message">{{ notice }}</p>
+
+      <div ref="stageRef" class="psd-stage">
+        <canvas
+          v-show="hasImage && !error"
+          ref="canvasRef"
+          class="psd-canvas"
+        />
+        <div v-if="!hasImage && !error && !busy" class="empty-state">
+          <strong>Photoshop (.psd) 파일을 선택해 주세요.</strong>
+          <span>
+            RGB·Grayscale·Bitmap / 8bit .psd만 브라우저에서 볼 수 있습니다.
+            파일을 열거나 이 영역으로 끌어다 놓으세요.
+          </span>
+          <button type="button" @click="onOpen">파일 열기</button>
+        </div>
+        <div v-if="dropActive" class="drop-overlay" aria-hidden="true">
+          .psd 파일을 놓으세요
+        </div>
+      </div>
+    </div>
+  </AppShell>
+</template>
+
+<style scoped>
+.psd-page {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  height: 100%;
+  background: var(--canvas);
+  position: relative;
+}
+
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
+.psd-controls {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  justify-content: flex-end;
+  gap: 0.65rem;
+  padding: 0.45rem 0.85rem;
+  border-bottom: 1px solid var(--border);
+  background: var(--surface);
+}
+
+.psd-controls__group {
+  display: flex;
+  align-items: center;
+  gap: 0.4rem;
+}
+
+.psd-controls__label {
+  min-width: 3.5rem;
+  text-align: center;
+  font-size: 0.82rem;
+  font-variant-numeric: tabular-nums;
+  color: var(--ink-soft);
+}
+
+.psd-btn {
+  font: inherit;
+  font-size: 0.8rem;
+  font-weight: 600;
+  padding: 0.28rem 0.65rem;
+  border-radius: 6px;
+  border: 1px solid var(--border);
+  background: var(--card);
+  color: var(--ink);
+  cursor: pointer;
+}
+
+.psd-btn:hover:not(:disabled) {
+  border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
+  background: var(--card-hover);
+}
+
+.psd-btn:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+.viewer-message {
+  margin: 0;
+  padding: 0.45rem 0.85rem;
+  font-size: 0.82rem;
+  color: var(--ink-soft);
+  border-bottom: 1px solid var(--border);
+  background: var(--surface);
+}
+
+.viewer-message--error {
+  color: var(--danger);
+  background: color-mix(in srgb, var(--danger) 10%, var(--surface));
+}
+
+.psd-stage {
+  flex: 1;
+  min-height: 0;
+  position: relative;
+  overflow: auto;
+  display: grid;
+  place-items: center;
+  padding: 1rem;
+  background:
+    linear-gradient(45deg, #ececec 25%, transparent 25%),
+    linear-gradient(-45deg, #ececec 25%, transparent 25%),
+    linear-gradient(45deg, transparent 75%, #ececec 75%),
+    linear-gradient(-45deg, transparent 75%, #ececec 75%);
+  background-size: 16px 16px;
+  background-position:
+    0 0,
+    0 8px,
+    8px -8px,
+    -8px 0;
+  background-color: #f7f7f7;
+}
+
+@media (prefers-color-scheme: dark) {
+  .psd-stage {
+    background-color: #1a1a1a;
+    background-image:
+      linear-gradient(45deg, #242424 25%, transparent 25%),
+      linear-gradient(-45deg, #242424 25%, transparent 25%),
+      linear-gradient(45deg, transparent 75%, #242424 75%),
+      linear-gradient(-45deg, transparent 75%, #242424 75%);
+  }
+}
+
+.psd-canvas {
+  display: block;
+  max-width: none;
+  box-shadow: 0 4px 24px rgb(0 0 0 / 18%);
+}
+
+.empty-state {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: 0.55rem;
+  max-width: 28rem;
+  padding: 1.25rem 1.35rem;
+  border-radius: 10px;
+  border: 1px solid var(--border);
+  background: var(--surface);
+  color: var(--ink);
+}
+
+.empty-state strong {
+  font-size: 1rem;
+}
+
+.empty-state span {
+  font-size: 0.88rem;
+  color: var(--muted);
+  line-height: 1.45;
+}
+
+.empty-state button {
+  font: inherit;
+  font-size: 0.86rem;
+  font-weight: 600;
+  margin-top: 0.25rem;
+  padding: 0.4rem 0.85rem;
+  border: none;
+  border-radius: 6px;
+  background: var(--accent);
+  color: #fff;
+  cursor: pointer;
+}
+
+.drop-overlay {
+  position: absolute;
+  inset: 0;
+  display: grid;
+  place-items: center;
+  background: color-mix(in srgb, var(--accent) 22%, transparent);
+  color: var(--ink);
+  font-weight: 650;
+  font-size: 1.05rem;
+  pointer-events: none;
+  z-index: 2;
+}
+
+.psd-page.is-drop-active .psd-stage {
+  outline: 2px dashed var(--accent);
+  outline-offset: -8px;
+}
+</style>

packages/frontend/src/views/RhwpEditorView.vue

@@ -1,37 +1,47 @@
 <script setup lang="ts">
-import { onMounted, onUnmounted, ref } from 'vue';
+import { nextTick, onActivated, onMounted, onUnmounted, ref } from 'vue';
 import { useRouter } from 'vue-router';
 import { createEditor, type RhwpEditor } from '@rhwp/editor';
 import AppShell from '@/components/AppShell.vue';
+import DownloadGuideModal from '@/components/DownloadGuideModal.vue';
 import EditorErrorState from '@/components/EditorErrorState.vue';
 import EditorToolbar from '@/components/EditorToolbar.vue';
 import { ApiError } from '@/api/client';
-import { extensionOf, isHwp } from '@/config/app';
+import { isHwp } from '@/config/app';
 import { usePageTitle } from '@/composables/usePageTitle';
 import {
   clearHwpFile,
+  hwpOpenToken,
   loadHwpFile,
   storeHwpFile,
   useSessionLifecycle,
 } from '@/composables/useSessionLifecycle';
-import { downloadBlob } from '@/utils/downloadBlob';
 
 defineOptions({ name: 'RhwpEditorView' });
 
 const router = useRouter();
 const error = ref<unknown>(null);
 const filename = ref('문서.hwp');
+const guideOpen = ref(false);
 const fileInput = ref<HTMLInputElement | null>(null);
 let editor: RhwpEditor | null = null;
-let initialized = false;
+let loadedToken = '';
+let loadSeq = 0;
 
 usePageTitle(filename);
 useSessionLifecycle({ enableHeartbeat: true });
 
-onMounted(async () => {
+const downloadGuideSteps = [
-  if (initialized) return;
+  '편집기 메뉴에서 파일을 누릅니다.',
+  '저장 또는 다른 이름으로 저장을 선택합니다.',
+  '원하는 위치와 이름으로 저장합니다.',
+];
 
+async function bootstrapFromStore() {
+  const seq = ++loadSeq;
+  const token = hwpOpenToken();
   const stored = loadHwpFile();
+
   if (!stored) {
     error.value = new ApiError(
       404,
@@ -41,25 +51,51 @@ onMounted(async () => {
     return;
   }
 
+  // Same staged file already shown (e.g. mounted + activated).
+  if (editor && loadedToken === token && loadedToken !== '0') {
+    filename.value = stored.name;
+    error.value = null;
+    return;
+  }
+
   filename.value = stored.name;
   error.value = null;
 
   try {
+    await nextTick();
+    if (seq !== loadSeq) return;
+
+    if (!editor) {
       editor = await createEditor('#rhwp-host', {
         width: '100%',
         height: '100%',
       });
+    }
+    if (seq !== loadSeq) return;
+
     await editor.loadFile(stored.buffer, stored.name);
-    initialized = true;
+    if (seq !== loadSeq) return;
+
+    loadedToken = token;
   } catch (err) {
+    if (seq !== loadSeq) return;
     error.value = err;
   }
+}
+
+onMounted(() => {
+  void bootstrapFromStore();
+});
+
+onActivated(() => {
+  void bootstrapFromStore();
 });
 
 onUnmounted(() => {
+  loadSeq += 1;
   editor?.destroy();
   editor = null;
-  initialized = false;
+  loadedToken = '';
 });
 
 function onOpen() {
@@ -70,7 +106,7 @@ async function onFileSelected(e: Event) {
   const input = e.target as HTMLInputElement;
   const file = input.files?.[0];
   input.value = '';
-  if (!file || !editor) return;
+  if (!file) return;
 
   if (!isHwp(file.name)) {
     error.value = new ApiError(
@@ -83,30 +119,16 @@ async function onFileSelected(e: Event) {
 
   try {
     await storeHwpFile(file);
-    const stored = loadHwpFile();
+    // Token bump remounts via App viewKey; also reload in place if not remounted.
-    if (!stored) throw new Error('파일을 읽을 수 없습니다.');
+    loadedToken = '';
-    await editor.loadFile(stored.buffer, stored.name);
+    await bootstrapFromStore();
-    filename.value = stored.name;
-    error.value = null;
   } catch (err) {
     error.value = err;
   }
 }
 
-async function onSave() {
+async function onDownload() {
-  if (!editor) return;
+  guideOpen.value = true;
-  try {
-    const ext = extensionOf(filename.value);
-    const bytes =
-      ext === 'hwpx' ? await editor.exportHwpx() : await editor.exportHwp();
-    const name =
-      ext === 'hwpx' || ext === 'hwp'
-        ? filename.value
-        : `${filename.value}.hwp`;
-    downloadBlob(bytes, name);
-  } catch (err) {
-    error.value = err;
-  }
 }
 
 function onClose() {
@@ -122,7 +144,7 @@ function onClose() {
         v-if="!error"
         :filename="filename"
         @open="onOpen"
-        @save="onSave"
+        @save="onDownload"
         @close="onClose"
       />
       <input
@@ -135,6 +157,14 @@ function onClose() {
 
       <EditorErrorState v-if="error" :error="error" context="rhwp" />
       <div v-show="!error" id="rhwp-host" class="editor-frame" />
+
+      <DownloadGuideModal
+        :open="guideOpen"
+        lead="수정한 한글 문서는 rhwp 편집기 메뉴에서 받을 수 있습니다."
+        :steps="downloadGuideSteps"
+        path-hint="파일 → 저장(다른 이름으로 저장)"
+        @close="guideOpen = false"
+      />
     </div>
   </AppShell>
 </template>

packages/frontend/src/views/ToolsBgRemoveView.vue

@@ -0,0 +1,654 @@
+<script setup lang="ts">
+import { computed, onBeforeUnmount, ref, watch } from 'vue';
+import { useRouter } from 'vue-router';
+import AppShell from '@/components/AppShell.vue';
+import EditorToolbar from '@/components/EditorToolbar.vue';
+import { useFileDropZone } from '@/composables/useFileDropZone';
+import { usePageTitle } from '@/composables/usePageTitle';
+import {
+  DEFAULT_BG_REMOVE_OPTIONS,
+  removeBackgroundBySample,
+  type BgRemoveMode,
+  type Rgb,
+} from '@/integrations/bgremove/removeBg';
+import { decodeIcoToPng, isIcoFile } from '@/integrations/imageedit/ico';
+import { downloadBlob } from '@/utils/downloadBlob';
+
+defineOptions({ name: 'ToolsBgRemoveView' });
+
+const router = useRouter();
+const fileInput = ref<HTMLInputElement | null>(null);
+const filename = ref('배경 제거');
+const sourceUrl = ref<string | null>(null);
+const resultUrl = ref<string | null>(null);
+const background = ref<Rgb | null>(null);
+const busy = ref(false);
+const error = ref('');
+const notice = ref('');
+const tolerance = ref(DEFAULT_BG_REMOVE_OPTIONS.tolerance);
+const feather = ref(DEFAULT_BG_REMOVE_OPTIONS.feather);
+const mode = ref<BgRemoveMode>(DEFAULT_BG_REMOVE_OPTIONS.mode);
+const imageUrlInput = ref('');
+
+usePageTitle(filename, { faviconKind: 'bgremove' });
+
+const hasImage = computed(() => Boolean(sourceUrl.value));
+const bgCss = computed(() => {
+  if (!background.value) return '';
+  const { r, g, b } = background.value;
+  return `rgb(${r}, ${g}, ${b})`;
+});
+
+function revoke(url: string | null) {
+  if (url?.startsWith('blob:')) URL.revokeObjectURL(url);
+}
+
+function baseName(name = filename.value) {
+  return name.replace(/\.[^.]+$/, '') || 'logo';
+}
+
+function onClose() {
+  void router.push({ name: 'home' });
+}
+
+function onOpen() {
+  fileInput.value?.click();
+}
+
+function isImageFile(file: File) {
+  if (isIcoFile(file)) return true;
+  if (file.type.startsWith('image/')) return true;
+  return /\.(png|jpe?g|webp|gif|bmp|svg)$/i.test(file.name);
+}
+
+async function loadFile(file: File) {
+  if (!isImageFile(file)) {
+    error.value = 'PNG, JPEG, WebP, GIF, BMP, SVG, ICO 이미지를 선택해 주세요.';
+    return;
+  }
+  error.value = '';
+  notice.value = '';
+  revoke(sourceUrl.value);
+  revoke(resultUrl.value);
+  resultUrl.value = null;
+  background.value = null;
+  filename.value = file.name;
+  if (isIcoFile(file)) {
+    try {
+      const decoded = await decodeIcoToPng(await file.arrayBuffer());
+      sourceUrl.value = URL.createObjectURL(decoded.blob);
+    } catch (reason) {
+      error.value =
+        reason instanceof Error ? reason.message : 'ICO를 열지 못했습니다.';
+      return;
+    }
+  } else {
+    sourceUrl.value = URL.createObjectURL(file);
+  }
+  await processImage();
+}
+
+async function loadFromUrl(raw = imageUrlInput.value) {
+  const trimmed = raw.trim();
+  if (!trimmed) {
+    error.value = '이미지 URL을 입력해 주세요.';
+    return;
+  }
+  let parsed: URL;
+  try {
+    parsed = new URL(trimmed);
+  } catch {
+    error.value = '올바른 이미지 URL을 입력해 주세요.';
+    return;
+  }
+  if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') {
+    error.value = 'http(s) URL만 사용할 수 있습니다.';
+    return;
+  }
+
+  busy.value = true;
+  error.value = '';
+  notice.value = '';
+  try {
+    const response = await fetch(parsed.href, { mode: 'cors' });
+    if (!response.ok) {
+      throw new Error(`이미지를 가져오지 못했습니다 (${response.status}).`);
+    }
+    const blob = await response.blob();
+    const looksImage =
+      blob.type.startsWith('image/') ||
+      /\.(png|jpe?g|webp|gif|bmp|svg|ico)(\?|$)/i.test(parsed.pathname);
+    if (!looksImage) {
+      throw new Error('응답이 이미지가 아닙니다.');
+    }
+    const leaf = decodeURIComponent(
+      parsed.pathname.split('/').filter(Boolean).pop() || 'image',
+    );
+    const name = /\.[a-z0-9]+$/i.test(leaf) ? leaf : `${leaf}.png`;
+    const file = new File([blob], name, {
+      type: blob.type || 'image/png',
+    });
+    imageUrlInput.value = parsed.href;
+    await loadFile(file);
+  } catch (reason) {
+    const message =
+      reason instanceof Error ? reason.message : 'URL에서 이미지를 불러오지 못했습니다.';
+    error.value = /Failed to fetch|NetworkError|CORS/i.test(message)
+      ? '이미지를 가져오지 못했습니다. CORS를 허용하는 URL인지 확인해 주세요.'
+      : message;
+  } finally {
+    busy.value = false;
+  }
+}
+
+function onFilesSelected(event: Event) {
+  const input = event.target as HTMLInputElement;
+  const file = input.files?.[0];
+  input.value = '';
+  if (file) void loadFile(file);
+}
+
+const {
+  dropActive,
+  onDragEnter,
+  onDragOver,
+  onDragLeave,
+  onDrop: onZoneDrop,
+} = useFileDropZone((files) => {
+  const file = files[0];
+  if (file) void loadFile(file);
+});
+
+async function processImage() {
+  if (!sourceUrl.value) return;
+  busy.value = true;
+  error.value = '';
+  try {
+    const result = await removeBackgroundBySample(sourceUrl.value, {
+      tolerance: tolerance.value,
+      feather: feather.value,
+      mode: mode.value,
+    });
+    revoke(resultUrl.value);
+    resultUrl.value = result.url;
+    background.value = result.background;
+    notice.value = '배경을 제거했습니다.';
+  } catch (reason) {
+    error.value =
+      reason instanceof Error ? reason.message : '배경 제거에 실패했습니다.';
+  } finally {
+    busy.value = false;
+  }
+}
+
+function exportPng() {
+  if (!resultUrl.value) return;
+  void fetch(resultUrl.value)
+    .then((response) => response.blob())
+    .then((blob) => downloadBlob(blob, `${baseName()}-transparent.png`));
+}
+
+watch(mode, () => {
+  if (sourceUrl.value) void processImage();
+});
+
+onBeforeUnmount(() => {
+  revoke(sourceUrl.value);
+  revoke(resultUrl.value);
+});
+</script>
+
+<template>
+  <AppShell :editor="true">
+    <div
+      class="bg-page"
+      :class="{ 'is-drop-active': dropActive }"
+      @dragenter="onDragEnter"
+      @dragover="onDragOver"
+      @dragleave="onDragLeave"
+      @drop="onZoneDrop"
+    >
+      <EditorToolbar
+        :filename="filename"
+        :show-save="Boolean(resultUrl)"
+        :busy="busy"
+        @open="onOpen"
+        @save="exportPng"
+        @close="onClose"
+      />
+      <input
+        ref="fileInput"
+        class="sr-only"
+        type="file"
+        accept="image/png,image/jpeg,image/webp,image/gif,image/bmp,image/svg+xml,image/x-icon,image/vnd.microsoft.icon,.png,.jpg,.jpeg,.webp,.gif,.bmp,.svg,.ico"
+        @change="onFilesSelected"
+      />
+
+      <p v-if="error" class="viewer-message viewer-message--error" role="alert">
+        {{ error }}
+      </p>
+      <p v-else-if="notice" class="viewer-message">{{ notice }}</p>
+
+      <main class="workspace">
+        <div
+          v-if="!hasImage"
+          class="empty"
+          :class="{ 'is-drop-active': dropActive }"
+        >
+          <strong>배경 제거</strong>
+          <p>
+            단색 배경 로고 이미지를 열거나 끌어다 놓으면 모서리 색을 기준으로
+            배경을 투명하게 만듭니다. 흰 배경·검은 배경 모두 처리됩니다.
+          </p>
+          <button
+            type="button"
+            class="btn-primary"
+            :disabled="busy"
+            @click="onOpen"
+          >
+            이미지 열기
+          </button>
+          <form class="url-form" @submit.prevent="void loadFromUrl()">
+            <input
+              v-model="imageUrlInput"
+              type="url"
+              inputmode="url"
+              placeholder="https://example.com/logo.png"
+              :disabled="busy"
+              aria-label="이미지 URL"
+            />
+            <button type="submit" :disabled="busy">URL 불러오기</button>
+          </form>
+        </div>
+
+        <template v-else>
+          <div class="controls">
+            <form class="url-form url-form--inline" @submit.prevent="void loadFromUrl()">
+              <input
+                v-model="imageUrlInput"
+                type="url"
+                inputmode="url"
+                placeholder="이미지 URL"
+                :disabled="busy"
+                aria-label="이미지 URL"
+              />
+              <button type="submit" :disabled="busy">URL</button>
+            </form>
+            <label class="field field--mode">
+              <span>모드</span>
+              <select v-model="mode" :disabled="busy">
+                <option value="threshold">전체 유사색 (글자 구멍 포함)</option>
+                <option value="flood">바깥만 (모서리 연결)</option>
+              </select>
+            </label>
+            <label class="field">
+              <span class="field__row">
+                허용치
+                <em>{{ tolerance }}</em>
+              </span>
+              <input
+                type="range"
+                min="0"
+                max="100"
+                step="1"
+                :value="tolerance"
+                :disabled="busy"
+                @input="
+                  tolerance = Number(($event.target as HTMLInputElement).value)
+                "
+                @change="void processImage()"
+              />
+            </label>
+            <label class="field">
+              <span class="field__row">
+                가장자리
+                <em>{{ feather }}</em>
+              </span>
+              <input
+                type="range"
+                min="0"
+                max="100"
+                step="1"
+                :value="feather"
+                :disabled="busy"
+                @input="
+                  feather = Number(($event.target as HTMLInputElement).value)
+                "
+                @change="void processImage()"
+              />
+            </label>
+            <div v-if="background" class="swatch" title="추정 배경색">
+              <span class="swatch__chip" :style="{ background: bgCss }" />
+              <span>배경 {{ bgCss }}</span>
+            </div>
+            <button
+              type="button"
+              class="btn-primary"
+              :disabled="busy || !resultUrl"
+              @click="exportPng"
+            >
+              PNG 저장
+            </button>
+          </div>
+
+          <div class="panes">
+            <section class="pane">
+              <h2>원본</h2>
+              <div class="frame">
+                <img :src="sourceUrl!" alt="원본" />
+              </div>
+            </section>
+            <section class="pane">
+              <h2>결과</h2>
+              <div class="frame frame--checker">
+                <img v-if="resultUrl" :src="resultUrl" alt="배경 제거 결과" />
+                <p v-else class="muted">처리 중…</p>
+              </div>
+            </section>
+          </div>
+        </template>
+
+        <div
+          v-if="dropActive && hasImage"
+          class="drop-overlay"
+          aria-hidden="true"
+        >
+          이미지를 놓아 바꾸기
+        </div>
+      </main>
+    </div>
+  </AppShell>
+</template>
+
+<style scoped>
+.bg-page {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  min-height: 0;
+  height: 100%;
+  background: var(--canvas);
+}
+
+.workspace {
+  position: relative;
+  flex: 1;
+  min-height: 0;
+  overflow: auto;
+  padding: 0.85rem;
+}
+
+.empty {
+  height: 100%;
+  min-height: min(60vh, 28rem);
+  display: grid;
+  place-content: center;
+  justify-items: center;
+  gap: 0.75rem;
+  text-align: center;
+  color: var(--ink);
+  border: 1px dashed transparent;
+  border-radius: 6px;
+  padding: 1.25rem;
+}
+
+.empty.is-drop-active {
+  border-color: var(--accent);
+  background: var(--accent-soft);
+}
+
+.empty p {
+  margin: 0;
+  max-width: 28rem;
+  color: var(--muted);
+  font-size: 0.92rem;
+  line-height: 1.45;
+}
+
+.btn-primary {
+  min-height: 2.5rem;
+  border: 1px solid var(--accent);
+  border-radius: 4px;
+  padding: 0.4rem 0.9rem;
+  background: var(--accent-soft);
+  color: var(--ink);
+  font: inherit;
+  font-weight: 600;
+  cursor: pointer;
+}
+
+.btn-primary:disabled {
+  opacity: 0.5;
+  cursor: default;
+}
+
+.url-form {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.4rem;
+  width: min(100%, 28rem);
+  margin-top: 0.25rem;
+}
+
+.url-form input {
+  flex: 1 1 12rem;
+  min-height: 2.5rem;
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  padding: 0.35rem 0.55rem;
+  background: var(--canvas);
+  color: var(--ink);
+  font: inherit;
+}
+
+.url-form button {
+  min-height: 2.5rem;
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  padding: 0.35rem 0.75rem;
+  background: var(--surface);
+  color: var(--ink);
+  font: inherit;
+  cursor: pointer;
+}
+
+.url-form button:disabled {
+  opacity: 0.5;
+  cursor: default;
+}
+
+.url-form--inline {
+  width: auto;
+  flex: 1 1 16rem;
+  margin-top: 0;
+  align-items: end;
+}
+
+.url-form--inline input {
+  min-height: 2.25rem;
+}
+
+.url-form--inline button {
+  min-height: 2.25rem;
+}
+
+.controls {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: end;
+  gap: 0.75rem 1rem;
+  margin-bottom: 0.85rem;
+  padding: 0.65rem 0.75rem;
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  background: var(--surface);
+}
+
+.field {
+  display: grid;
+  gap: 0.3rem;
+  min-width: 10rem;
+  flex: 1 1 12rem;
+  font-size: 0.86rem;
+}
+
+.field--mode {
+  flex: 0 1 16rem;
+}
+
+.field__row {
+  display: flex;
+  justify-content: space-between;
+  gap: 0.5rem;
+}
+
+.field__row em {
+  font-style: normal;
+  font-variant-numeric: tabular-nums;
+  color: var(--muted);
+}
+
+.field select,
+.field input[type='range'] {
+  width: 100%;
+  accent-color: var(--accent);
+}
+
+.field select {
+  min-height: 2.25rem;
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  padding: 0.3rem 0.45rem;
+  background: var(--canvas);
+  color: var(--ink);
+  font: inherit;
+}
+
+.swatch {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.4rem;
+  min-height: 2.25rem;
+  font-size: 0.8rem;
+  color: var(--muted);
+}
+
+.swatch__chip {
+  width: 1.1rem;
+  height: 1.1rem;
+  border-radius: 3px;
+  border: 1px solid var(--border);
+}
+
+.panes {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 0.85rem;
+  align-items: start;
+}
+
+.pane {
+  min-width: 0;
+  overflow: auto;
+}
+
+.pane h2 {
+  margin: 0 0 0.45rem;
+  font-size: 0.9rem;
+}
+
+.frame {
+  display: inline-block;
+  width: fit-content;
+  max-width: 100%;
+  padding: 0.75rem;
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  background: var(--surface);
+  overflow: auto;
+  vertical-align: top;
+  line-height: 0;
+}
+
+.frame--checker {
+  background-color: #c8c8c8;
+  background-image:
+    linear-gradient(45deg, #efefef 25%, transparent 25%),
+    linear-gradient(-45deg, #efefef 25%, transparent 25%),
+    linear-gradient(45deg, transparent 75%, #efefef 75%),
+    linear-gradient(-45deg, transparent 75%, #efefef 75%);
+  background-size: 20px 20px;
+  background-position:
+    0 0,
+    0 10px,
+    10px -10px,
+    -10px 0;
+}
+
+.frame img {
+  display: block;
+  width: auto;
+  height: auto;
+  max-width: none;
+  max-height: none;
+}
+
+.muted {
+  margin: 0;
+  color: var(--muted);
+}
+
+.drop-overlay {
+  position: absolute;
+  inset: 0.75rem;
+  z-index: 20;
+  display: grid;
+  place-items: center;
+  border: 2px dashed var(--accent);
+  border-radius: 8px;
+  background: color-mix(in srgb, var(--accent-soft) 88%, transparent);
+  color: var(--ink);
+  font-weight: 650;
+  pointer-events: none;
+}
+
+.viewer-message {
+  margin: 0;
+  padding: 0.45rem 0.85rem;
+  border-bottom: 1px solid var(--border);
+  background: var(--surface);
+  color: var(--ink);
+  font-size: 0.86rem;
+}
+
+.viewer-message--error {
+  color: #b42318;
+  background: color-mix(in srgb, #b42318 10%, var(--surface));
+}
+
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
+
+@media (max-width: 900px) {
+  .panes {
+    grid-template-columns: 1fr;
+  }
+
+  .controls {
+    align-items: stretch;
+  }
+
+  .controls .btn-primary {
+    width: 100%;
+  }
+}
+</style>