fix(nav): trim burger menu, fix MyClasses for teachers, fix NotFound crash

- Header: trim menu to My Work section (My Lessons, My Classes, Lesson Plans), School Admin (gated), Platform Admin (gated)
- MyClassesPage: fix loading/error state destructure (classesLoading not myClassesLoading)
- NotFound: fix ErrorOutline -> ErrorOutlineIcon to prevent 404 page crash
- timetableService: getMyClasses now calls both /me/teacher and /me/student, merges with role annotation
- timetableStore: myClasses type updated to ClassWithRole[]
- timetable.types: add ClassWithRole interface and code/institute_id optional fields to Class

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

src/services/timetableService.ts

@@ -2,6 +2,7 @@ import axios from 'axios';
 import { supabase } from '../supabaseClient';
 import {
   Class,
+  ClassWithRole,
   ClassWithRelations,
   ClassFilters,
   Timetable,
@@ -79,10 +80,30 @@ export const classService = {
     await axios.delete(`${API_BASE}/database/timetable/classes/${classId}`, { headers });
   },
 
-  async getMyClasses(): Promise<Class[]> {
+  async getMyClasses(): Promise<ClassWithRole[]> {
     const headers = await getAuthHeaders();
-    const response = await axios.get(`${API_BASE}/database/timetable/classes/me/student`, { headers });
-    return response.data.classes;
+    const [teacherRes, studentRes] = await Promise.allSettled([
+      axios.get(`${API_BASE}/database/timetable/classes/me/teacher`, { headers }),
+      axios.get(`${API_BASE}/database/timetable/classes/me/student`, { headers }),
+    ]);
+    const teacherClasses: ClassWithRole[] = teacherRes.status === 'fulfilled'
+      ? (teacherRes.value.data.classes || []).map((c: Class) => ({
+          ...c,
+          class_id: c.id,
+          role: 'teacher' as const,
+          status: 'active',
+        }))
+      : [];
+    const studentClasses: ClassWithRole[] = studentRes.status === 'fulfilled'
+      ? (studentRes.value.data.classes || []).map((c: Class) => ({
+          ...c,
+          class_id: c.id,
+          role: 'student' as const,
+          status: 'active',
+        }))
+      : [];
+    const seen = new Set(teacherClasses.map(c => c.id));
+    return [...teacherClasses, ...studentClasses.filter(c => !seen.has(c.id))];
   },
 
   async getMyTeachingClasses(): Promise<Class[]> {