feat: implement Firecrawl web scraping integration

- Add Firecrawl SDK dependency for web scraping functionality
- Create /api/scrape endpoint to handle website content extraction
- Replace mock data with real Firecrawl API integration
- Add recent sources section showing scraped content excerpts
- Update UI to display scraping success/error messages
- Fix API response structure handling for Firecrawl integration

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

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

package.json

@@ -9,6 +9,7 @@
     "lint": "eslint"
   },
   "dependencies": {
+    "@mendable/firecrawl-js": "^4.3.5",
     "@radix-ui/react-progress": "^1.1.7",
     "@radix-ui/react-slot": "^1.2.3",
     "class-variance-authority": "^0.7.1",