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/DriverPodDetailSection.tsx

@@ -8,7 +8,7 @@
 
 import { NameValueTable, SectionBox } from '@kinvolk/headlamp-plugin/lib/CommonComponents';
 import React from 'react';
-import { formatAge, isPodReady, getPodRestarts, TnsCsiPod } from '../api/k8s';
+import { formatAge, getPodRestarts, isPodReady, TnsCsiPod } from '../api/k8s';
 
 interface DriverPodDetailSectionProps {
   resource: {