[QA PASSED] All requirements verified successfully. ✅ DeviceQuickControls component removed from Control page ✅ device-quick-controls.tsx file deleted (300 lines purged) ✅ Control page uses only RackDiagramSection with mode='control' ✅ Unified component working on both Control and Settings pages Testing results: - All 111 frontend tests: PASSED - Production build: SUCCESS - Code search verification: No remaining references - Component integration: VERIFIED Full report: /tmp/qa-APC-66.md

Fixed by removing the duplicate DeviceQuickControls component from the Control page. **Changes made:** 1. Updated `frontend/src/app/page.tsx`: - Removed import of `DeviceQuickControls` - Removed the separate "Device Controls" section that used `DeviceQuickControls` - Now uses only `RackDiagramSection mode="control"` for device management 2. Deleted `frontend/src/components/device-quick-controls.tsx`: - This component was only used on the Control page - Its functionality is now fully covered by `RackDiagramSection` with `mode="control"` - Clicking a device in the rack diagram opens `DeviceControlModal` which provides full power control (On/Off/Reboot) **Before vs After:** - Before: Control page had both `DeviceQuickControls` (card grid) AND `RackDiagramSection` (rack diagram) - After: Control page uses only `RackDiagramSection mode="control"` which provides the same power control functionality through the rack visualization **Verification:** - Frontend build: SUCCESS - All 111 tests: PASSED Both Settings and Control pages now use the unified `RackDiagramSection` component: - Control page: `mode="control"` - device clicks open power control modal - Settings page: `mode="settings"` - device clicks open edit dialog