feat(frontend): student dashboard course-plans, interactive workbook, media uploads, branches

Ported from monorepo v4 commit 3b62075d (frontend/* portion).

- StudentDashboard: surface assigned AI course plans alongside enrollments;
  enrolled-courses stat now counts plans + enrollments
- InteractiveWorkbook + PlanReader components for live exercise solving
- AdminCoursePlanDetail: media drawer with upload buttons (audio/image/video),
  hidden file inputs, upload mutation
- AdminBranches page (entity-scoped LMS branches) + sidebar entry
- coursePlan / lms / classrooms services + types updated for new endpoints
  (assignments, branches, classroom_ext, workbook attempts)
- i18n: studentDash.myCoursePlans / studentDash.noCoursePlans (en + ar)

Made-with: Cursor

src/components/AdminLmsLayout.tsx

@@ -54,6 +54,8 @@ const lmsItems: NavItem[] = [
   { titleKey: "nav.courses", url: "/admin/courses", icon: BookOpen },
   { titleKey: "nav.students", url: "/admin/students", icon: Users },
   { titleKey: "nav.teachers", url: "/admin/teachers", icon: GraduationCap },
+  { titleKey: "nav.branches", url: "/admin/branches", icon: GitBranch },
+  { titleKey: "nav.classrooms", url: "/admin/classrooms", icon: GraduationCap },
   { titleKey: "nav.batches", url: "/admin/batches", icon: Layers },
   { titleKey: "nav.timetable", url: "/admin/timetable", icon: Calendar },
   { titleKey: "nav.reports", url: "/admin/reports", icon: BarChart3 },
@@ -97,7 +99,6 @@ const institutionalItems: NavItem[] = [
 const managementItems: NavItem[] = [
   { titleKey: "nav.users", url: "/admin/users", icon: Users },
   { titleKey: "nav.entities", url: "/admin/entities", icon: Building2 },
-  { titleKey: "nav.classrooms", url: "/admin/classrooms", icon: GraduationCap },
   { titleKey: "nav.userRoles", url: "/admin/user-roles", icon: UserCog },
   { titleKey: "nav.rolesPermissions", url: "/admin/roles-permissions", icon: Settings },
   { titleKey: "nav.authorityMatrix", url: "/admin/authority-matrix", icon: Workflow },
@@ -167,7 +168,7 @@ function SidebarNavGroup({ labelKey, items }: { labelKey: string; items: NavItem
 const routeLabelKeys: Record<string, string> = {
   admin: "breadcrumb.admin", dashboard: "breadcrumb.dashboard",
   platform: "breadcrumb.platform", courses: "nav.courses",
-  students: "nav.students", teachers: "nav.teachers", batches: "nav.batches",
+  students: "nav.students", teachers: "nav.teachers", branches: "nav.branches", batches: "nav.batches",
   timetable: "nav.timetable", reports: "nav.reports",
   assignments: "nav.assignments", examsList: "nav.examsList",
   "exam-structures": "nav.examStructures", rubrics: "nav.rubrics",