fix: resolve bugs in benchmark lifecycle, snapshot filtering, and dark mode

- Fix PVC bind loop leak on unmount via cancellation ref
- Fix DeleteOptions body structure for proper foreground propagation
- Filter snapshots to tns-csi driver only (was showing all drivers)
- Fix stale closures in Escape key handlers with useCallback
- Add loading state to cleanup delete button, remove window.confirm/alert
- Use CSS custom properties for protocol chart colors (dark mode support)
- Fix all 35 ESLint warnings (import sort, indent, boolean attrs)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/DriverStatusCard.test.tsx

@@ -6,8 +6,8 @@ vi.mock(
   async () => await import('./__mocks__/commonComponents')
 );
 
+import { makeSampleMetrics, makeSamplePod, sampleCSIDriver } from '../test-helpers';
 import DriverStatusCard from './DriverStatusCard';
-import { makeSamplePod, sampleCSIDriver, makeSampleMetrics } from '../test-helpers';
 
 describe('DriverStatusCard', () => {
   it('shows "Not detected" when no CSI driver is present', () => {