fix: register AppBarClusterBadge, fix CSI label mismatch, improve accessibility and theme support

- Register AppBarClusterBadge via registerAppBarAction (was dead code)
- Add Rook 1.12+ CSI pod labels to CephPodDetailSection alongside legacy labels
- Add sidebar entries for Storage Classes and Volumes pages
- Add role="dialog", aria-modal, aria-labelledby, and Escape key to all detail drawers
- Replace hardcoded hex colors with CSS custom properties for dark/light theme compat
- Remove duplicate parseStorageToBytes from OverviewPage (import from k8s.ts)
- Add endpoints field to CephObjectStoreStatus interface (remove unsafe cast)
- Use ROOK_CEPH_API_GROUP/VERSION constants in API URL construction
- Hoist extractJsonData to module level
- Remove dead extractPoolFromVolumeHandle function
- Fix redundant storageClasses.length guard in OverviewPage
- Fix lint indent warnings
- Update CLAUDE.md and CHANGELOG.md

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

src/components/AppBarClusterBadge.tsx

@@ -15,13 +15,13 @@ import { useRookCephContext } from '../api/RookCephDataContext';
 function getHealthColor(health: string | undefined): string {
   switch (health) {
     case 'HEALTH_OK':
-      return '#4caf50';
+      return 'var(--mui-palette-success-main, #4caf50)';
     case 'HEALTH_WARN':
-      return '#ff9800';
+      return 'var(--mui-palette-warning-main, #ff9800)';
     case 'HEALTH_ERR':
-      return '#f44336';
+      return 'var(--mui-palette-error-main, #f44336)';
     default:
-      return '#9e9e9e';
+      return 'var(--mui-palette-action-disabled, #9e9e9e)';
   }
 }