Based on the diffs, here's the concise commit message:

fix: handle API response format and improve group sync tests

src/services/group-sync.ts

@@ -55,7 +55,11 @@ export class GroupSyncService {
       throw new Error(`API request failed: ${response.statusText}`);
     }
 
-    return response.json();
+    const data = await response.json();
+    if (data.status !== 'success') {
+      throw new Error(`API error: ${data.message || 'Unknown error'}`);
+    }
+    return data.response;
   }
 
   private static async upsertGroups(groups: EvolutionGroup[]): Promise<{ added: number; updated: number }> {

tests/unit/services/group-sync.test.ts

@@ -52,12 +52,21 @@ describe('GroupSyncService', () => {
 
     it('should filter groups by community ID', async () => {
       const result = await GroupSyncService.syncGroups();
-      expect(result.added).toBe(1);
-      expect(result.updated).toBe(0);
+      expect(result).toEqual({
+        added: 1,
+        updated: 0
+      });
       
       const groups = db.query('SELECT * FROM groups').all();
-      expect(groups).toHaveLength(1);
-      expect(groups[0].id).toBe('group1');
+      expect(groups).toEqual([
+        {
+          id: 'group1',
+          community_id: 'test-community',
+          name: 'Group 1',
+          active: 1,
+          last_verified: expect.any(String)
+        }
+      ]);
     });
 
     it('should update existing groups', async () => {
@@ -67,23 +76,37 @@ describe('GroupSyncService', () => {
       );
 
       const result = await GroupSyncService.syncGroups();
-      expect(result.added).toBe(0);
-      expect(result.updated).toBe(1);
+      expect(result).toEqual({
+        added: 0,
+        updated: 1
+      });
 
       const group = db.query('SELECT * FROM groups WHERE id = ?').get('group1');
-      expect(group.name).toBe('Group 1');
-      expect(group.active).toBe(1);
+      expect(group).toEqual({
+        id: 'group1',
+        community_id: 'test-community',
+        name: 'Group 1',
+        active: 1,
+        last_verified: expect.any(String)
+      });
     });
 
     it('should mark non-matching groups as inactive', async () => {
       // Add initial group not in current sync
       db.exec(
-        "INSERT INTO groups (id, community_id, name, active) VALUES ('old-group', 'test-community', 'Old Group', 1)"
+        "INSERT INTO groups (id, community_id, name, active, last_verified) VALUES ('old-group', 'test-community', 'Old Group', 1, '2023-01-01')"
       );
 
       await GroupSyncService.syncGroups();
-      const group = db.query('SELECT active FROM groups WHERE id = ?').get('old-group');
-      expect(group.active).toBe(0);
+      const group = db.query('SELECT * FROM groups WHERE id = ?').get('old-group');
+      expect(group).toEqual({
+        id: 'old-group',
+        community_id: 'test-community',
+        name: 'Old Group',
+        active: 0,
+        last_verified: expect.any(String)
+      });
+      expect(group.last_verified).not.toBe('2023-01-01'); // Should be updated
     });
 
     it('should handle API errors', async () => {