# Code Review Report: Task Board Bulk Stop, Reset & State Management

**Date:** 2026-02-19
**Reviewer:** Code Review Agent
**Component:** Task Board (web-ui/src/components/tasks/)
**PR:** #389 (feature/issue-340-task-board-bulk-actions)
**Files Reviewed:** 6 production files, 5 test files
**Ready for Production:** Yes

## Executive Summary

Well-structured feature addition that extends the Task Board with single-task and bulk stop/reset actions. Three rounds of review (CodeRabbit, Claude bot, manual) identified and resolved all issues. Final code is clean, accessible, and well-tested.

**Critical Issues:** 0
**Major Issues:** 0 (all resolved)
**Minor Issues:** 2 (accepted trade-offs, documented below)
**Positive Findings:** 8

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## Review Context

**Code Type:** UI Components (React/Next.js)
**Risk Level:** Low-Medium (UI-only, calls existing backend APIs)
**Business Constraints:** Standard feature, no performance-critical requirements

### Review Focus Areas

- ✅ A04 Insecure Design — Workflow race conditions, state consistency
- ✅ Reliability — Error handling, async cleanup, loading states
- ✅ Maintainability — Type safety, test coverage, code patterns
- ❌ A01 Access Control — Skipped, frontend doesn't enforce auth
- ❌ A03 Injection — Skipped, no raw user input to backend
- ❌ LLM/ML Security — Not applicable

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## Priority 1 Issues - Critical

None.

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## Priority 2 Issues - Major (All Resolved)

### 1. Loading state cleared before SWR refresh (RESOLVED)
**Location:** `TaskBoardView.tsx:237-268`
**Fix:** Wrapped `handleConfirmAction` in try/finally, loading flags reset in finally block.

### 2. Missing try/finally could leave dialog stuck (RESOLVED)
**Location:** `TaskBoardView.tsx:237-268`
**Fix:** Same try/finally restructure.

### 3. selectedTasks scope inconsistency with filters (RESOLVED)
**Location:** `TaskBoardView.tsx:83-86`
**Fix:** `selectedTasks` now derives from `data?.tasks` instead of `filteredTasks`.

### 4. Tests relied on mock-specific data-testid (RESOLVED)
**Location:** `TaskCard.test.tsx`
**Fix:** Replaced `getByTestId('icon-Loading03Icon')` with `getByRole('status', { name: /loading/i })`.

### 5. SWR revalidation race condition on confirmation count (RESOLVED)
**Location:** `TaskBoardView.tsx:227-235`
**Fix:** Task IDs frozen into `confirmAction` state at dialog-open time.

### 6. BulkActionType included unreachable 'execute' variant (RESOLVED)
**Location:** `BulkActionConfirmDialog.tsx:15`
**Fix:** Narrowed type to `'stop' | 'reset'`, removed dead config entry.

### 7. Missing test for partial failure in batch operations (RESOLVED)
**Location:** `TaskBoardView.test.tsx`
**Fix:** Added test that mocks `stopExecution` rejection and verifies error banner.

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## Priority 3 Issues - Minor

### 1. Unsafe error cast `err as ApiError`
**Location:** `TaskBoardView.tsx:173, 194`
**Category:** Type Safety

The `err as ApiError` pattern doesn't guarantee `.detail` exists on non-API errors (e.g., TypeError). However, the fallback string always fires for non-API errors since `undefined || 'fallback'` resolves correctly. This is also the pre-existing pattern used throughout the codebase.

**Decision:** Accepted. Functionally correct. Fixing only in new code would be inconsistent.

### 2. handleClearSelection fires on partial failure
**Location:** `TaskBoardView.tsx:265`
**Category:** UX

When 3 of 5 bulk-stop calls fail, selection is cleared, losing visibility into which tasks were affected. The error message does report failure count.

**Decision:** Accepted trade-off for v1. Retaining selection on partial failure would require tracking per-task success/failure state.

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## Positive Findings

1. **Race condition mitigation**: Freezing `taskIds` into `confirmAction` at dialog-open time isolates batch from SWR revalidation mid-flight.
2. **Promise.allSettled**: Correct choice for bulk ops — partial failures handled gracefully.
3. **AlertDialog over Dialog**: Proper Radix primitive for destructive confirmations (focus trap, explicit dismiss).
4. **Accessibility**: `role="alert"` on error banner, `role="status"` on spinner, dismiss button, keyboard nav preserved, ARIA labels on all interactive elements.
5. **e.preventDefault() on AlertDialogAction**: Prevents auto-close before async confirm completes.
6. **Per-task loading state**: `loadingTaskIds` Set prevents double-clicks and gives clear visual feedback.
7. **useCallback/useMemo throughout**: Handlers are stable references, derived state is memoized.
8. **Comprehensive test coverage**: 302 tests covering happy paths, error paths, loading states, accessibility, and now partial failures.

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## Action Items Summary

### Immediate (Before Merge)
All resolved.

### Short-term (Backlog)
1. Consider retaining selection on partial bulk-action failure
2. Consider a shared `extractErrorDetail(err)` utility for safer error extraction

### Long-term (Backlog)
1. Shift-click range selection for task checkboxes (deferred from issue #340)

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## Conclusion

All critical and major issues from three review rounds have been resolved. The implementation follows existing codebase patterns, uses proper Shadcn/UI primitives, maintains accessibility standards, and has thorough test coverage including edge cases. Ready to merge.

**Recommendation:** Deploy
