feat: phone login via QR when the saved Mudfish login expires

When autologin is rejected the panel offers '휴대폰으로 로그인 (QR)'. It opens
a 5-minute LAN relay to the launcher UI guarded by a one-time token (first
phone to open the QR URL is the only client allowed) and shows the URL as a
QR code. The relay closes as soon as a new session appears, on cancel, on
expiry, and on unload.

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

pnpm-lock.yaml

@@ -11,6 +11,9 @@ importers:
       '@decky/api':
         specifier: ^1.1.3
         version: 1.1.3
+      qrcode-generator:
+        specifier: 1.4.4
+        version: 1.4.4
       react-icons:
         specifier: ^5.3.0
         version: 5.7.0(react@19.3.1)
@@ -771,6 +774,9 @@ packages:
     resolution: {integrity: sha512-qcJu88Q2IWqJsDD529JKMdwGm/dvInW4HvQnRwiH9JtihJvzGOscDtHE3x1pBKeUOTysQ8kVmLnJ2kJu7yhcGA==}
     engines: {node: '>=12'}
 
+  qrcode-generator@1.4.4:
+    resolution: {integrity: sha512-HM7yY8O2ilqhmULxGMpcHSF1EhJJ9yBj8gvDEuZ6M+KGJ0YY2hKpnXvRD+hZPLrDVck3ExIGhmPtSdcjC+guuw==}
+
   queue-microtask@1.2.3:
     resolution: {integrity: sha512-NuaNSa6flKT5JaSYQzJok04JzTL1CA6aGhv5rfLW3PgqA+M2ChpZQnAC8h8i4ZFkBS8X5RqkDBHA7r4hej3K9A==}
 
@@ -1599,6 +1605,8 @@ snapshots:
 
   picomatch@4.0.7: {}
 
+  qrcode-generator@1.4.4: {}
+
   queue-microtask@1.2.3: {}
 
   react-icons@5.7.0(react@19.3.1):