feat: Round 22 - Exam calendar, parent portal, teacher grading, deep styling

- Exam calendar integration: Plan Exam button, countdown badges, exam filter
- Parent portal: Children overview, illness approvals, grades, attendance
- Teacher grading: Stylus annotation, AI review, bulk grading mode
- Deep schlaukopf crawling: AI-powered content extraction from schlaukopf.de
- Dashboard: Upcoming exams, AI tips section
- Settings: AI provider config, virtual character toggle, management tabs
- Layout: Favorites section, notification badges on sidebar items
- Auth: VICE_PRINCIPAL demo account, feature showcase
- Attendance: Illness report integration
- Assessments: Plan exam button, AI test generation
- Fixed schoolId auto-detect in counseling and disciplinary APIs
- Added MessageSquare import to settings-view
- 150+ new i18n keys

src/lib/store.ts

@@ -37,7 +37,8 @@ export type ViewName =
   | 'communication'
   | 'counseling'
   | 'disciplinary'
-  | 'ai-tests';
+  | 'ai-tests'
+  | 'parent-portal';
 
 export interface CurrentUser {
   id: string;