Update graduation workflow, promotions, and admin module improvements

app/Http/Controllers/UserManagementController.php

@@ -30,6 +30,11 @@ class UserManagementController extends Controller
             'users' => $users,
             'search' => $search,
             'roleOptions' => $this->roleOptions(),
+            'stats' => [
+                'total' => User::count(),
+                'admins' => User::where('role', 'admin')->count(),
+                'staff' => User::where('role', 'staff')->count(),
+            ],
         ]);
     }
 
@@ -77,10 +82,14 @@ class UserManagementController extends Controller
     public function destroy(Request $request, User $user): RedirectResponse
     {
         if ((int) $request->user()->id === (int) $user->id) {
+            Alert::error('Tidak bisa dihapus', 'Akun yang sedang dipakai login tidak bisa dihapus.');
+
             return back()->withErrors(['user' => 'Akun yang sedang dipakai login tidak bisa dihapus.']);
         }
 
         if (User::query()->where('role', 'admin')->count() <= 1 && $user->role === 'admin') {
+            Alert::error('Tidak bisa dihapus', 'Minimal harus ada satu akun admin aktif di sistem.');
+
             return back()->withErrors(['user' => 'Minimal harus ada satu akun admin aktif di sistem.']);
         }