v0.9.33 bugs fixes

backend/src/routes/groups.js

@@ -383,6 +383,8 @@ router.delete('/:id/leave', authMiddleware, (req, res) => {
 // Admin take ownership
 router.post('/:id/take-ownership', authMiddleware, adminMiddleware, (req, res) => {
   const db = getDb();
+  const group = db.prepare('SELECT * FROM groups WHERE id = ?').get(req.params.id);
+  if (group?.is_managed) return res.status(403).json({ error: 'Managed groups are administered via the Group Manager.' });
   db.prepare("UPDATE groups SET owner_id = ?, updated_at = datetime('now') WHERE id = ?").run(req.user.id, req.params.id);
   db.prepare('INSERT OR IGNORE INTO group_members (group_id, user_id) VALUES (?, ?)').run(req.params.id, req.user.id);
   res.json({ success: true });