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/lib/api.mcp.test.ts

@@ -20,7 +20,7 @@ function jsonResponse(body: unknown, init: ResponseInit = {}) {
   });
 }
 
-function getLastFetchCall(fetchMock: ReturnType<typeof vi.fn>) {
+function getLastFetchCall(fetchMock: any) {
   const calls = fetchMock.mock.calls;
   return calls[calls.length - 1] as [RequestInfo | URL, RequestInit | undefined];
 }