feat(i18n,rtl): full Arabic localization + RTL sweep across all layouts

Frontend
- i18n: install tailwindcss-rtl, Cairo font, RTL-aware direction in index.css.
- Language toggle: localize aria-label / menu label, persist choice, update
  document dir synchronously.
- Sidebar: add `side` prop so the drawer pins to the right in RTL; wire up
  AdminLmsLayout, RoleLayout (student/teacher) and AppSidebar to pass
  side = i18n.dir() === 'rtl' ? 'right' : 'left'.
- AdminLmsLayout: convert every nav item from hard-coded title to titleKey,
  translate group labels (incl. the collapsible Training), breadcrumbs,
  user menu (Profile / Settings / Logout), help button and toggle aria
  labels; replace physical mr-/right- utilities with logical me-/end-.
- AI components (AiTipBanner, AiInsightsPanel, AiAlertBanner, AiSearchBar,
  AiAssistantDrawer): apply dir="auto" at the container level, localize
  titles, loading / error / empty states.
- Dashboards (admin / student / teacher): wrap numeric values in <bdi>,
  localize dates via ar-EG, fix flex direction for KPI and assignment cards.
- UI primitives (breadcrumb, calendar, carousel, dropdown-menu, menubar,
  context-menu, pagination, sidebar): flip chevrons in RTL via a scoped
  CSS rule, swap pl-/pr-/ml-/mr- for ps-/pe-/ms-/me-.
- Add logical-direction helpers and bidirectional isolation classes.

Locales
- Expand en.ts and ar.ts with full `nav`, `sidebarGroup`, `breadcrumb`,
  `userMenu`, `chrome`, `ai`, and dashboard key sets; keep key parity.

API client
- `api-client.ts` reads the active language from localStorage/i18n and sends
  `Accept-Language` on every request so the backend can localize AI output.

Backend (encoach_ai)
- openai_service: add _LANGUAGE_NAMES, normalize_language, language-aware
  system prompt injection for every OpenAI call.
- coach_service + controllers (coach_controller, ai_controller): thread
  the requested language from headers / user locale down to OpenAIService.
- ai_feedback: fix latent registry error by pointing course_id at op.course
  instead of the non-existent encoach.course.

Other
- .gitignore: ignore runtime odoo logs and local caches.

Made-with: Cursor

frontend/src/components/StudentLayout.tsx

@@ -2,47 +2,52 @@ import RoleLayout, { NavGroup } from "./RoleLayout";
 import ExamPopup from "./student/ExamPopup";
 import {
   LayoutDashboard, BookOpen, ClipboardList, BarChart3,
-  CalendarCheck, Calendar, User, Target, GraduationCap, ListChecks,
+  CalendarCheck, Calendar, User, Target, ListChecks,
   MessageSquare, Megaphone, Mail, TrendingUp,
 } from "lucide-react";
 
+/**
+ * Student portal shell. Nav items hold i18n keys which `RoleLayout`
+ * resolves via `useTranslation`, so switching language does not require
+ * re-mounting the layout.
+ */
 const navGroups: NavGroup[] = [
   {
-    label: "Learning",
+    labelKey: "sidebarGroup.learning",
     items: [
-      { title: "Dashboard", url: "/student/dashboard", icon: LayoutDashboard },
-      { title: "My Courses", url: "/student/courses", icon: BookOpen },
-      { title: "Subject Registration", url: "/student/subject-registration", icon: ListChecks },
-      { title: "Assignments", url: "/student/assignments", icon: ClipboardList },
+      { titleKey: "nav.dashboard", url: "/student/dashboard", icon: LayoutDashboard },
+      { titleKey: "nav.myCourses", url: "/student/courses", icon: BookOpen },
+      { titleKey: "nav.subjectRegistration", url: "/student/subject-registration", icon: ListChecks },
+      { titleKey: "nav.assignments", url: "/student/assignments", icon: ClipboardList },
     ],
   },
   {
-    label: "Adaptive Learning",
+    labelKey: "sidebarGroup.adaptiveLearning",
     items: [
-      { title: "My Subjects", url: "/student/subjects", icon: Target },
+      { titleKey: "nav.mySubjects", url: "/student/subjects", icon: Target },
     ],
   },
   {
-    label: "Progress",
+    labelKey: "sidebarGroup.progress",
     items: [
-      { title: "Grades", url: "/student/grades", icon: BarChart3 },
-      { title: "Attendance", url: "/student/attendance", icon: CalendarCheck },
-      { title: "Timetable", url: "/student/timetable", icon: Calendar },
-      { title: "My Journey", url: "/student/journey", icon: TrendingUp },
+      { titleKey: "nav.grades", url: "/student/grades", icon: BarChart3 },
+      { titleKey: "nav.attendance", url: "/student/attendance", icon: CalendarCheck },
+      { titleKey: "nav.timetable", url: "/student/timetable", icon: Calendar },
+      { titleKey: "nav.myJourney", url: "/student/journey", icon: TrendingUp },
     ],
   },
   {
-    label: "Communication",
+    labelKey: "sidebarGroup.communication",
     items: [
-      { title: "Discussions", url: "/student/discussions", icon: MessageSquare },
-      { title: "Messages", url: "/student/messages", icon: Mail },
-      { title: "Announcements", url: "/student/announcements", icon: Megaphone },
+      { titleKey: "nav.discussions", url: "/student/discussions", icon: MessageSquare },
+      { titleKey: "nav.messages", url: "/student/messages", icon: Mail },
+      { titleKey: "nav.announcements", url: "/student/announcements", icon: Megaphone },
     ],
   },
   {
-    label: "Account",
+    labelKey: "sidebarGroup.account",
     items: [
-      { title: "Profile", url: "/student/profile", icon: User },
+      { titleKey: "nav.profile", url: "/student/profile", icon: User },
     ],
   },
 ];