Fix of the Notifications Funktions and the notifications system in generell in regarts to the Vapid key handeling

Web/app.py

@@ -10376,18 +10376,15 @@ def my_borrowed_items():
 @app.route('/notifications')
 def notifications_view():
     """Notification center for users and admins."""
+    from Web.push_notifications import _get_vapid_public
     if 'username' not in session:
         flash('Bitte melden Sie sich an, um Benachrichtigungen zu sehen.', 'error')
         return redirect(url_for('login'))
 
     username = session['username']
-    is_admin_user = False
     current_permissions = us.get_effective_permissions(session['username'])
-        
-    if not current_permissions['actions'].get('can_manage_settings', False):
-        is_admin_user = True
-    else:
-        is_admin_user = False
+
+    is_admin_user = current_permissions['actions'].get('can_manage_settings', False)
 
     client = None
     try:
@@ -10421,6 +10418,7 @@ def notifications_view():
             is_admin_user=is_admin_user,
             library_module_enabled=cfg.MODULES.is_enabled('library'),
             student_cards_module_enabled=cfg.MODULES.is_enabled('student_cards'),
+            vapid_public_key=_get_vapid_public()
         )
     except Exception as exc:
         app.logger.error(f"Error loading notifications: {exc}")