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/ClusterStatusCard.tsx

@@ -110,9 +110,16 @@ export default function ClusterStatusCard({
                       {
                         name: 'Used',
                         value: bytesUsed,
-                        fill: usedPct > 80 ? '#f44336' : '#1976d2',
+                        fill:
+                          usedPct > 80
+                            ? 'var(--mui-palette-error-main, #f44336)'
+                            : 'var(--mui-palette-primary-main, #1976d2)',
+                      },
+                      {
+                        name: 'Free',
+                        value: bytesAvail,
+                        fill: 'var(--mui-palette-action-disabledBackground, #e0e0e0)',
                       },
-                      { name: 'Free', value: bytesAvail, fill: '#e0e0e0' },
                     ]}
                     total={bytesTotal}
                   />