FEATURE: Comprehensive multimedia file handling with professional components

- Integrated react-markdown with GitHub Flavored Markdown support
- Added react-pdf for PDF viewing with full navigation controls
- Implemented react-syntax-highlighter for code syntax highlighting
- Added dual-pane Markdown editor with live preview capability
- Fixed PDF.js worker configuration with local fallback
- Enhanced internationalization support for all multimedia controls
- Removed unsupported download buttons from Markdown editor
- Resolved version compatibility issues between PDF API and worker

技术改进 Claude Code生成

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

package.json

@@ -87,6 +87,7 @@
     "nanoid": "^5.1.5",
     "next-themes": "^0.4.6",
     "node-fetch": "^3.3.2",
+    "pdfjs-dist": "^5.4.149",
     "qrcode": "^1.5.4",
     "react": "^19.1.0",
     "react-dom": "^19.1.0",
@@ -94,11 +95,15 @@
     "react-hook-form": "^7.60.0",
     "react-i18next": "^15.7.3",
     "react-icons": "^5.5.0",
+    "react-markdown": "^10.1.0",
+    "react-pdf": "^10.1.0",
     "react-photo-view": "^1.2.7",
     "react-player": "^3.3.3",
     "react-resizable-panels": "^3.0.3",
     "react-simple-keyboard": "^3.8.120",
+    "react-syntax-highlighter": "^15.6.6",
     "react-xtermjs": "^1.0.10",
+    "remark-gfm": "^4.0.1",
     "sonner": "^2.0.7",
     "speakeasy": "^2.0.0",
     "ssh2": "^1.16.0",