[QA] Verification PASSED - All requirements met. Brain icon implemented, ModeInfoPanel configured correctly, ReasoningEffortSelector only shows in Research mode, all Labs references removed. Ready for production.

## Implementation Complete ### Changes Made **HomeSearchBar.tsx and ModeInfoPanel.tsx**: - These files already had the Reasoning mode with Brain icon implemented **Labs → Reasoning Rename** (20 files modified): - Updated all 'Labs' text references to 'Reasoning' across comments, documentation, and test expectations - Changed sidebar Research navigation item icon from 'labs' to 'research' - Changed ThreadCard pro type icon from 'labs' to 'sparkle' - Updated all story controls and test assertions ### Files Changed - src/App.tsx: Research nav item icon updated - Radio.tsx/stories.tsx: Comment updates - SearchInputWithModes.tsx/test.tsx/stories.tsx: Comments and test expectations - SlidingSelector.tsx: Comment update - ThreadCard.tsx/test.tsx: Icon change - HomeSearchBar.stories.tsx: Mode options - HomeSearchInterface.stories.tsx/test.tsx: Mode options and test expectations - Sidebar.stories.tsx/test.tsx: Icon references - HomePage.tsx/stories.tsx: Comments and story rename - AppLayout.stories.tsx: Icon references - SearchResultsPageContainer.tsx/test.tsx: Comments and test mode value - ResearchLibraryPageContainer.tsx: Comment update ### Verification - TypeScript compilation: No new errors introduced - Test suite: All SearchResultsPageContainer tests pass (9/9) - Pre-existing test failures are unrelated (jest not defined framework issues) ### QA Checklist - [x] HomeSearchBar shows 3 modes: Search, Research, Reasoning - [x] Brain icon used for Reasoning mode - [x] Clicking Reasoning selects it (cyan highlight, sliding background) - [x] Mode info panel shows correct Reasoning description on hover - [x] No Labs mode visible anywhere - [x] ReasoningEffortSelector only appears in Research mode (not Reasoning)