feat: Implement phases 6 to 9 of the review cycle fix process, including discovery, batching, parallel planning, execution, and completion

- Added Phase 6: Fix Discovery & Batching with intelligent grouping and batching of findings.
- Added Phase 7: Fix Parallel Planning to launch planning agents for concurrent analysis and aggregation of partial plans.
- Added Phase 8: Fix Execution for stage-based execution of fixes with conservative test verification.
- Added Phase 9: Fix Completion to aggregate results, generate summary reports, and handle session completion.
- Introduced new frontend components: ResizeHandle for draggable resizing of sidebar panels and useResizablePanel hook for managing panel sizes with localStorage persistence.
- Added PowerShell script for checking TypeScript errors in source code, excluding test files.

ccw/frontend/src/hooks/useLocale.ts

@@ -56,6 +56,10 @@ export function useLocale(): UseLocaleReturn {
  * Hook to format i18n messages with the current locale
  * @returns A formatMessage function for translating message IDs
  *
+ * Supports both string and react-intl descriptor formats:
+ * - formatMessage('home.title')
+ * - formatMessage({ id: 'home.title' })
+ *
  * @example
  * ```tsx
  * const formatMessage = useFormatMessage();
@@ -63,12 +67,13 @@ export function useLocale(): UseLocaleReturn {
  * ```
  */
 export function useFormatMessage(): (
-  id: string,
+  idOrDescriptor: string | { id: string; defaultMessage?: string },
   values?: Record<string, string | number | boolean | Date | null | undefined>
 ) => string {
   // Use useMemo to avoid recreating the function on each render
   return useMemo(() => {
-    return (id: string, values?: Record<string, string | number | boolean | Date | null | undefined>) => {
+    return (idOrDescriptor: string | { id: string; defaultMessage?: string }, values?: Record<string, string | number | boolean | Date | null | undefined>) => {
+      const id = typeof idOrDescriptor === 'string' ? idOrDescriptor : idOrDescriptor.id;
       return formatMessage(id, values);
     };
   }, []);