refactor: Enhance Diff View with advanced line and character-level change detection

- Improved diff algorithm to detect more granular line and character-level changes
- Added support for character-level highlighting in diff view
- Simplified diff view mode by removing side-by-side option
- Updated component rendering to support more detailed change visualization
- Optimized line change detection with improved matching strategy

package.json

@@ -74,12 +74,11 @@
     "@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",
     "@remix-run/react": "^2.15.2",
+    "@tanstack/react-virtual": "^3.13.0",
     "@types/react-beautiful-dnd": "^13.1.8",
     "@uiw/codemirror-theme-vscode": "^4.23.6",
     "@unocss/reset": "^0.61.9",
@@ -105,7 +104,9 @@
     "js-cookie": "^3.0.5",
     "jspdf": "^2.5.2",
     "jszip": "^3.10.1",
+    "lucide-react": "^0.474.0",
     "nanostores": "^0.10.3",
+    "next-themes": "^0.4.4",
     "ollama-ai-provider": "^0.15.2",
     "path-browserify": "^1.0.1",
     "react": "^18.3.1",
@@ -135,6 +136,8 @@
     "@iconify-json/ph": "^1.2.1",
     "@iconify/types": "^2.0.0",
     "@remix-run/dev": "^2.15.2",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/react": "^16.2.0",
     "@types/diff": "^5.2.3",
     "@types/dom-speech-recognition": "^0.0.4",
     "@types/file-saver": "^2.0.7",
@@ -142,9 +145,11 @@
     "@types/path-browserify": "^1.0.3",
     "@types/react": "^18.3.12",
     "@types/react-dom": "^18.3.1",
+    "@vitejs/plugin-react": "^4.3.4",
     "fast-glob": "^3.3.2",
     "husky": "9.1.7",
     "is-ci": "^3.0.1",
+    "jsdom": "^26.0.0",
     "node-fetch": "^3.3.2",
     "pnpm": "^9.14.4",
     "prettier": "^3.4.1",