feat: Add Diff View and File History Tracking

- Implemented a new Diff view in the Workbench to track file changes
- Added file history tracking with version control and change tracking
- Created a FileModifiedDropdown to browse and manage modified files
- Enhanced ActionRunner to support file history persistence
- Updated Workbench and BaseChat components to support new diff view functionality
- Added support for inline and side-by-side diff view modes

package.json

@@ -74,6 +74,8 @@
     "@radix-ui/react-switch": "^1.1.1",
     "@radix-ui/react-tabs": "^1.1.2",
     "@radix-ui/react-tooltip": "^1.1.4",
+    "lucide-react": "^0.474.0",
+    "next-themes": "^0.4.4",
     "@remix-run/cloudflare": "^2.15.2",
     "@remix-run/cloudflare-pages": "^2.15.2",
     "@remix-run/node": "^2.15.2",