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/ui/sidebar.tsx

@@ -217,7 +217,7 @@ const Sidebar = React.forwardRef<
 Sidebar.displayName = "Sidebar";
 
 const SidebarTrigger = React.forwardRef<React.ElementRef<typeof Button>, React.ComponentProps<typeof Button>>(
-  ({ className, onClick, ...props }, ref) => {
+  ({ className, onClick, "aria-label": ariaLabel, ...props }, ref) => {
     const { toggleSidebar } = useSidebar();
 
     return (
@@ -226,6 +226,7 @@ const SidebarTrigger = React.forwardRef<React.ElementRef<typeof Button>, React.C
         data-sidebar="trigger"
         variant="ghost"
         size="icon"
+        aria-label={ariaLabel ?? "Toggle sidebar"}
         className={cn("h-7 w-7", className)}
         onClick={(event) => {
           onClick?.(event);
@@ -233,8 +234,8 @@ const SidebarTrigger = React.forwardRef<React.ElementRef<typeof Button>, React.C
         }}
         {...props}
       >
-        <PanelLeft />
-        <span className="sr-only">Toggle Sidebar</span>
+        <PanelLeft className="rtl:rotate-180" />
+        <span className="sr-only">{ariaLabel ?? "Toggle sidebar"}</span>
       </Button>
     );
   },