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/common/infra/src/livedata/react.ts

@@ -45,11 +45,11 @@ export function useEnsureLiveData<T>(liveData$: LiveData<T>): NonNullable<T> {
 
   if (data === null || data === undefined) {
     return use(
-      new Promise((resolve, reject) => {
+      new Promise<NonNullable<T>>((resolve, reject) => {
         const subscription = liveData$.subscribe({
           next(value) {
-            if (value === null || value === undefined) {
-              resolve(value);
+            if (value !== null && value !== undefined) {
+              resolve(value as NonNullable<T>);
               subscription.unsubscribe();
             }
           },
@@ -64,5 +64,5 @@ export function useEnsureLiveData<T>(liveData$: LiveData<T>): NonNullable<T> {
     );
   }
 
-  return data;
+  return data as NonNullable<T>;
 }