fix: patch P0 security vulnerabilities and critical UX issues across 6 modules

Security: Add admin/layout.tsx auth guard; Add requirePermission() to 12 admin pages

Dashboard: Fix StudentStatsGrid rendering; Fix teacher greeting; Add loading/error boundaries; Fix col-span; Add metadata

Announcements: Fix audience filtering; Add user detail page; Trigger notifications on publish; Pass classes data; Add loading.tsx

Messages: Implement soft delete; Add unread badge with polling; Add notification dropdown polling; Add keyword search; Add quiet hours DND

Management: Add loading/error for 9 admin routes; Fix admin-classes-view to use Select for school/grade

Profile/Settings: Add loading/error; Fix parent role routing; Create ParentSettingsView; Integrate AiProviderSettingsCard; Add Tab URL persistence; Add logout confirm; Add avatar; Fix Progress arbitrary class

Schema: Add senderDeletedAt/receiverDeletedAt to messages; Add quietHours to notificationPreferences; Add uniqueIndex import

Docs: Update architecture docs 004/005

src/shared/components/ui/progress.tsx

@@ -7,8 +7,11 @@ import { cn } from "@/shared/lib/utils"
 
 const Progress = React.forwardRef<
   React.ElementRef<typeof ProgressPrimitive.Root>,
-  React.ComponentPropsWithoutRef<typeof ProgressPrimitive.Root>
->(({ className, value, ...props }, ref) => (
+  React.ComponentPropsWithoutRef<typeof ProgressPrimitive.Root> & {
+    /** Optional className applied to the inner indicator element. */
+    indicatorClassName?: string
+  }
+>(({ className, value, indicatorClassName, ...props }, ref) => (
   <ProgressPrimitive.Root
     ref={ref}
     className={cn(
@@ -18,7 +21,7 @@ const Progress = React.forwardRef<
     {...props}
   >
     <ProgressPrimitive.Indicator
-      className="h-full w-full flex-1 bg-primary transition-all"
+      className={cn("h-full w-full flex-1 bg-primary transition-all", indicatorClassName)}
       style={{ transform: `translateX(-${100 - (value || 0)}%)` }}
     />
   </ProgressPrimitive.Root>