## QA VERIFICATION: PASSED ✅ The UsageBreakdownTable component has been thoroughly verified and meets all acceptance criteria. ### Verification Summary - **Code Review:** All 4 files created correctly (1,268 lines total) - **Tests:** 40/40 tests passing - **Storybook:** 9 stories built successfully - **Browser Testing:** All features verified with chrome-devtools ### Features Verified ✅ Sortable columns (Date, Model, Tokens, Cost) with visual indicators ✅ Query text truncation with tooltip on hover ✅ Pagination controls (tested navigation, shows "11-20 of 50" on page 2) ✅ Loading skeleton rows ✅ Empty state with custom message ✅ Responsive table with horizontal scroll ✅ Proper formatting (currency, numbers, dates) ✅ Accessibility attributes ### Browser Testing Results - **Default story:** Table renders correctly with all columns and data - **Loading story:** Skeleton rows display properly - **Empty story:** Empty state message shown - **Large Dataset story:** Pagination works (clicked Next, page changed 1→2, data updated) - **Sorting:** Click interactions registered in Storybook Actions Full QA report: /tmp/qa-PPLX-39.md **Status: APPROVED FOR MERGE**

## Implementation Complete ### Files Created - src/src/components/organisms/UsageBreakdownTable/UsageBreakdownTable.tsx - Main component - src/src/components/organisms/UsageBreakdownTable/UsageBreakdownTable.stories.tsx - 9 Storybook stories - src/src/components/organisms/UsageBreakdownTable/UsageBreakdownTable.test.tsx - 40 test cases - src/src/components/organisms/UsageBreakdownTable/index.ts - Exports ### Component Features - Sortable columns: Date, Model, Tokens, Cost (click header to sort) - Query text truncation: Truncates long queries with ellipsis, shows full text in Tooltip on hover - Pagination controls: Prev/Next buttons, page numbers with ellipsis for large page counts - Loading skeleton rows: Shows skeleton placeholders during loading - Empty state: Customizable empty message when no data - Responsive table: Horizontal scroll on mobile/narrow screens ### Storybook Stories (9 total) 1. Default - 10 rows of sample data 2. Loading - skeleton rows 3. Empty - no data message 4. SortedByCost - descending cost sort 5. SortedByDate - newest first 6. LargeDataset - 50 items with interactive pagination 7. MobileView - narrow viewport responsive layout 8. Interactive - full state management demo 9. LongQueryText - truncation and tooltip demo ### Tests (40 passing) All 40 tests pass: npm test -- UsageBreakdownTable ### Verification - Storybook builds successfully with all stories