feat(phase-b): school/timetable wizards, graph nav panel, UI updates

New components:
- CCGraphNavPanel: Supabase-driven navigation tree (school/timetable/calendar/classes sections),
  role-aware setup buttons, lazy child loading, academic/generic calendar toggle
- SchoolCalendarWizard: 3-step admin-only school setup (details → term dates → daily periods)
- TeacherTimetableWizard: period grid with existing slot pre-loading, edit-mode title

Updated:
- CCNodeSnapshotPanel: saves via Supabase storage path + accessToken
- BasePanel: nav panel tab wired to CCGraphNavPanel
- CCFilesPanelEnhanced: auth context fixes
- CCDocumentIntelligence suite: accessToken threading, Supabase storage integration

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

src/utils/tldraw/ui-overrides/components/shared/CCFilesPanelEnhanced.tsx

@@ -35,7 +35,7 @@ import DescriptionIcon from '@mui/icons-material/Description';
 import InsertDriveFileIcon from '@mui/icons-material/InsertDriveFile';
 import CloudUploadIcon from '@mui/icons-material/CloudUpload';
 import { useTLDraw } from '../../../../../contexts/TLDrawContext';
-import { supabase } from '../../../../../supabaseClient';
+import { useAuth } from '../../../../../contexts/AuthContext';
 import { useNavigate } from 'react-router-dom';
 import { 
   pickDirectory, 
@@ -75,7 +75,8 @@ interface UploadProgress {
 }
 
 export const CCFilesPanelEnhanced: React.FC = () => {
-  const { tldrawPreferences, authToken } = useTLDraw() as { tldrawPreferences?: { colorScheme?: 'light' | 'dark' | 'system' }, authToken?: string };
+  const { tldrawPreferences } = useTLDraw() as { tldrawPreferences?: { colorScheme?: 'light' | 'dark' | 'system' } };
+  const { user: authUser, accessToken } = useAuth();
   const prefersDarkMode = useMediaQuery('(prefers-color-scheme: dark)');
   const [cabinets, setCabinets] = useState<Cabinet[]>([]);
   const [selectedCabinet, setSelectedCabinet] = useState<string>('');
@@ -109,7 +110,7 @@ export const CCFilesPanelEnhanced: React.FC = () => {
 
   const apiFetch = async (url: string, init?: RequestInitLike) => {
     const headers: HeadersInitLike = {
-      'Authorization': `Bearer ${(await supabase.auth.getSession()).data.session?.access_token || authToken || ''}`,
+      'Authorization': `Bearer ${accessToken || ''}`,
       ...(init?.headers || {})
     };
     const fullUrl = url.startsWith('http') ? url : `${API_BASE}${url}`;
@@ -140,7 +141,7 @@ export const CCFilesPanelEnhanced: React.FC = () => {
     }
   };
 
-  useEffect(() => { loadCabinets(); }, []);
+  useEffect(() => { if (authUser?.id) { loadCabinets(); } }, [authUser?.id]);
   useEffect(() => { if (selectedCabinet) loadFiles(selectedCabinet); }, [selectedCabinet]);
 
   const handleSingleUpload = async (e: React.ChangeEvent<HTMLInputElement>) => {