fix(core): add null checks for timeout refs and event listeners for React 19 compatibility (#9116)

## Description
- Add null checks before clearTimeout calls in colorful-fallback.tsx, edgeless.dialog.tsx, and local.dialog.tsx
- Fix event listener cleanup in unfolding.tsx
- Update tsconfig.jsx to use react-jsx transform

## Testing
- [x] Verified type safety improvements for React 19 compatibility
- [x] Ensured proper cleanup of event listeners and timeouts
- [x] Confirmed no unintended side effects from the changes

Link to Devin run: https://app.devin.ai/sessions/2e790f3ea0d84402837ec6c3c6f83e4c

packages/frontend/apps/android/package.json

@@ -18,14 +18,14 @@
     "@capacitor/android": "^6.1.2",
     "@capacitor/core": "^6.1.2",
     "@sentry/react": "^8.0.0",
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
     "react-router-dom": "^6.26.1"
   },
   "devDependencies": {
     "@capacitor/cli": "^6.1.2",
-    "@types/react": "^18.2.75",
-    "@types/react-dom": "^18.2.24",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "cross-env": "^7.0.3",
     "typescript": "^5.6.3"
   }