Migrate to Euro-Office and refresh the editor home experience.

Swap Document Server to Euro-Office, add blank-document creation, and restyle the app with an Office-like light/dark theme and compact editor toolbar.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/backend/templates/blank.pdf

@@ -0,0 +1,18 @@
+%PDF-1.4
+1 0 obj<< /Type /Catalog /Pages 2 0 R >>endobj
+2 0 obj<< /Type /Pages /Kids [3 0 R] /Count 1 >>endobj
+3 0 obj<< /Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] /Contents 4 0 R /Resources << >> >>endobj
+4 0 obj<< /Length 0 >>stream
+endstream
+endobj
+xref
+0 5
+0000000000 65535 f 
+0000000009 00000 n 
+0000000058 00000 n 
+0000000115 00000 n 
+0000000229 00000 n 
+trailer<< /Size 5 /Root 1 0 R >>
+startxref
+279
+%%EOF