Address PR #19 review feedback round 3:

- TrackingData.group_id renamed to room_id (works for both group and DM)
- Removed room_id from TrackedBounty (it's just a lightweight pointer)

tests/test_models.py

@@ -83,14 +83,13 @@ class TestBounty:
 
 class TestTrackedBounty:
     def test_create_tracked_bounty(self):
-        tb = TrackedBounty(bounty_id=5, created_at=1735600000, room_id=-1001)
+        tb = TrackedBounty(bounty_id=5, created_at=1735600000)
         assert tb.bounty_id == 5
         assert tb.created_at == 1735600000
-        assert tb.room_id == -1001
 
     def test_tracked_bounty_comparison(self):
-        tb1 = TrackedBounty(bounty_id=1, created_at=0, room_id=-1001)
-        tb2 = TrackedBounty(bounty_id=1, created_at=0, room_id=-1001)
+        tb1 = TrackedBounty(bounty_id=1, created_at=0)
+        tb2 = TrackedBounty(bounty_id=1, created_at=0)
         assert tb1 == tb2
 
 
@@ -132,13 +131,13 @@ class TestRoomData:
 
 class TestTrackingData:
     def test_create_tracking_data(self):
-        td = TrackingData(group_id=-1001, user_id=123456, tracked=[])
-        assert td.group_id == -1001
+        td = TrackingData(room_id=-1001, user_id=123456, tracked=[])
+        assert td.room_id == -1001
         assert td.user_id == 123456
         assert td.tracked == []
 
     def test_tracking_data_with_tracked(self):
-        tb = TrackedBounty(bounty_id=5, created_at=0, room_id=-1001)
-        td = TrackingData(group_id=-1001, user_id=123, tracked=[tb])
+        tb = TrackedBounty(bounty_id=5, created_at=0)
+        td = TrackingData(room_id=-1001, user_id=123, tracked=[tb])
         assert len(td.tracked) == 1
         assert td.tracked[0].bounty_id == 5