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/BasePanel.tsx

@@ -34,6 +34,7 @@ import { CCYoutubePanel } from './CCYoutubePanel';
 import { CCGraphPanel } from './CCGraphPanel';
 import { CCExamMarkerPanel } from './CCExamMarkerPanel';
 import { CCSearchPanel } from './CCSearchPanel'
+import { CCGraphNavPanel } from './navigation/CCGraphNavPanel'
 import { CCTranscriptionPanel } from './CCTranscriptionPanel'
 import { PANEL_DIMENSIONS, Z_INDICES } from './panel-styles';
 import './panel.css';
@@ -145,7 +146,6 @@ export const BasePanel: React.FC<BasePanelProps> = ({
     return createTheme({
       palette: {
         mode,
-        divider: 'var(--color-divider)',
       },
     });
   }, [tldrawPreferences?.colorScheme, prefersDarkMode]);
@@ -281,6 +281,8 @@ export const BasePanel: React.FC<BasePanelProps> = ({
         return <CCGraphPanel />;
       case 'search':
         return <CCSearchPanel />;
+      case 'navigation':
+        return <CCGraphNavPanel />;
       default:
         return null;
     }
@@ -386,9 +388,11 @@ export const BasePanel: React.FC<BasePanelProps> = ({
             </div>
           </div>
 
+          <ThemeProvider theme={theme}>
           <div className="panel-content">
             {renderCurrentPanel()}
           </div>
+          </ThemeProvider>
         </div>
       )}
     </>