feat: Replaced Monaco diff editor with Pierre/diffs for better performance

packages/ui/package.json

@@ -15,6 +15,7 @@
     "@fontsource/ibm-plex-sans": "^5.1.1",
     "@ibm/plex": "^6.4.1",
     "@opencode-ai/sdk": "^1.0.65",
+    "@pierre/diffs": "^1.0.0",
     "@radix-ui/react-collapsible": "^1.1.12",
     "@radix-ui/react-dialog": "^1.1.15",
     "@radix-ui/react-dropdown-menu": "^2.1.16",
@@ -38,7 +39,6 @@
     "node-pty": "^1.0.0",
     "react": "^19.1.1",
     "react-dom": "^19.1.1",
-    "@monaco-editor/react": "^4.6.0",
     "react-syntax-highlighter": "^15.6.6",
     "simple-git": "^3.28.0",
     "sonner": "^2.0.7",