Add read-only Noya admin panel with assignments and UX polish.

Ship admin auth, user overview, assessments, chats, assignment filters/export, security hardening, and a separate desktop admin shell with clearer assessment answers.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/components/AppHeader.tsx

@@ -4,7 +4,7 @@ import { motion, AnimatePresence } from 'framer-motion';
 import { useAuth } from '@/hooks/useAuth';
 import { APP_NAME } from '@/utils/constants';
 import { BrandLogo } from '@/components/BrandLogo';
-import { ClipboardList, LogOut, Moon, Sun, User } from 'lucide-react';
+import { ClipboardList, LogOut, Moon, NotebookPen, Sun, User } from 'lucide-react';
 import { MOTION_DURATION, MOTION_EASE, fastTransition } from '@/lib/motion';
 import { useTheme } from '@/hooks/useTheme';
 import { cn } from '@/lib/utils';
@@ -127,6 +127,26 @@ export function AppHeader() {
                     <ClipboardList className="h-4 w-4 shrink-0 text-sky-600 dark:text-sky-400" />
                     وضعیت دوره
                   </Link>
+                  <Link
+                    to="/assignments"
+                    role="menuitem"
+                    className="header-menu-item"
+                    onClick={() => setMenuOpen(false)}
+                  >
+                    <NotebookPen className="h-4 w-4 shrink-0 text-sky-600 dark:text-sky-400" />
+                    تکالیف من
+                  </Link>
+                  {user?.role === 'admin' ? (
+                    <Link
+                      to="/admin"
+                      role="menuitem"
+                      className="header-menu-item"
+                      onClick={() => setMenuOpen(false)}
+                    >
+                      <ClipboardList className="h-4 w-4 shrink-0 text-sky-600 dark:text-sky-400" />
+                      پنل ادمین
+                    </Link>
+                  ) : null}
                   <button
                     type="button"
                     role="menuitem"