Feature: Add PR review comments and resolution, improve AI prompt handling (#790)

* feat: Add PR review comments and resolution endpoints, improve prompt handling

* Feature: File Editor (#789)

* feat: Add file management feature

* feat: Add auto-save functionality to file editor

* fix: Replace HardDriveDownload icon with Save icon for consistency

* fix: Prevent recursive copy/move and improve shell injection prevention

* refactor: Extract editor settings form into separate component

* ```
fix: Improve error handling and stabilize async operations

- Add error event handlers to GraphQL process spawns to prevent unhandled rejections
- Replace execAsync with execFile for safer command execution and better control
- Fix timeout cleanup in withTimeout generator to prevent memory leaks
- Improve outdated comment detection logic by removing redundant condition
- Use resolveModelString for consistent model string handling
- Replace || with ?? for proper falsy value handling in dialog initialization
- Add comments clarifying branch name resolution logic for local branches with slashes
- Add catch handler for project selection to handle async errors gracefully
```

* refactor: Extract PR review comments logic to dedicated service

* fix: Improve robustness and UX for PR review and file operations

* fix: Consolidate exec utilities and improve type safety

* refactor: Replace ScrollArea with div and improve file tree layout

apps/ui/src/hooks/mutations/index.ts

@@ -62,6 +62,7 @@ export {
   useValidateIssue,
   useMarkValidationViewed,
   useGetValidationStatus,
+  useResolveReviewThread,
 } from './use-github-mutations';
 
 // Ideation mutations

apps/ui/src/hooks/mutations/use-github-mutations.ts

@@ -135,6 +135,55 @@ export function useMarkValidationViewed(projectPath: string) {
   });
 }
 
+/**
+ * Resolve or unresolve a PR review thread
+ *
+ * @param projectPath - Path to the project
+ * @param prNumber - PR number (for cache invalidation)
+ * @returns Mutation for resolving/unresolving a review thread
+ *
+ * @example
+ * ```tsx
+ * const resolveThread = useResolveReviewThread(projectPath, prNumber);
+ * resolveThread.mutate({ threadId: comment.threadId, resolve: true });
+ * ```
+ */
+export function useResolveReviewThread(projectPath: string, prNumber: number) {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: async ({ threadId, resolve }: { threadId: string; resolve: boolean }) => {
+      const api = getElectronAPI();
+      if (!api.github?.resolveReviewThread) {
+        throw new Error('Resolve review thread API not available');
+      }
+
+      const result = await api.github.resolveReviewThread(projectPath, threadId, resolve);
+
+      if (!result.success) {
+        throw new Error(result.error || 'Failed to resolve review thread');
+      }
+
+      return { isResolved: result.isResolved ?? resolve };
+    },
+    onSuccess: (_, variables) => {
+      const action = variables.resolve ? 'resolved' : 'unresolved';
+      toast.success(`Comment ${action}`, {
+        description: `The review thread has been ${action} on GitHub`,
+      });
+      // Invalidate the PR review comments cache to reflect updated resolved status
+      queryClient.invalidateQueries({
+        queryKey: queryKeys.github.prReviewComments(projectPath, prNumber),
+      });
+    },
+    onError: (error) => {
+      toast.error('Failed to update comment', {
+        description: error instanceof Error ? error.message : 'Unknown error',
+      });
+    },
+  });
+}
+
 /**
  * Get running validation status
  *