v0.9.26 added a admin tools

backend/src/routes/groups.js

@@ -340,6 +340,7 @@ router.delete('/:id/leave', authMiddleware, (req, res) => {
   const group = db.prepare('SELECT * FROM groups WHERE id = ?').get(req.params.id);
   if (!group) return res.status(404).json({ error: 'Group not found' });
   if (group.type === 'public') return res.status(400).json({ error: 'Cannot leave public groups' });
+  if (group.is_managed && req.user.role !== 'admin') return res.status(403).json({ error: 'This group is managed by an administrator. Contact an admin to be removed.' });
 
   const userId = req.user.id;
   const leaverName = req.user.display_name || req.user.name;