feat: add comprehensive PDF support

- Add jsPDF for PDF generation from text/Markdown/HTML
- Add PDF.js for PDF text extraction (read PDFs)
- Support PDF → Text/Markdown conversions
- Support Markdown/HTML/Text → PDF conversions
- Implement page-by-page PDF text extraction
- Automatic pagination and formatting for generated PDFs

Supported PDF operations:
- Extract text from PDF files (all pages)
- Convert PDF to Markdown or plain text
- Create formatted PDFs from Markdown, HTML, or plain text
- Automatic text wrapping and page breaks

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

package.json

@@ -15,9 +15,11 @@
     "clsx": "^2.1.1",
     "dompurify": "^3.2.2",
     "fuse.js": "^7.1.0",
+    "jspdf": "^2.5.2",
     "lucide-react": "^0.553.0",
     "marked": "^15.0.4",
     "next": "^16.0.0",
+    "pdfjs-dist": "^4.10.38",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "tailwind-merge": "^3.3.1",