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/ObjectStoresPage.tsx

@@ -15,12 +15,16 @@ import { CephObjectStore, formatAge, phaseToStatus } from '../api/k8s';
 import { useRookCephContext } from '../api/RookCephDataContext';
 
 function ObjectStoreDetail({ store, onClose }: { store: CephObjectStore; onClose: () => void }) {
-  const endpoints = (store.status as unknown as Record<string, unknown>)?.endpoints as
-    | { insecure?: string[]; secure?: string[] }
-    | undefined;
+  const endpoints = store.status?.endpoints;
 
   return (
     <div
+      role="dialog"
+      aria-modal="true"
+      aria-labelledby="drawer-title-objectstore"
+      onKeyDown={e => {
+        if (e.key === 'Escape') onClose();
+      }}
       style={{
         position: 'fixed',
         top: 0,
@@ -42,7 +46,7 @@ function ObjectStoreDetail({ store, onClose }: { store: CephObjectStore; onClose
           marginBottom: '16px',
         }}
       >
-        <strong>{store.metadata.name}</strong>
+        <strong id="drawer-title-objectstore">{store.metadata.name}</strong>
         <button
           onClick={onClose}
           aria-label="Close"