✨(backend) add recording mode to serialized fields

Include recording mode in serialized data to enable conditional UI elements
in frontend. Allows download controls to be dynamically enabled or disabled
based on the specific recording type being used.

Screen recording will be downloadable when transcript won't.

src/backend/core/api/serializers.py

@@ -156,7 +156,7 @@ class RecordingSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = models.Recording
-        fields = ["id", "room", "created_at", "updated_at", "status"]
+        fields = ["id", "room", "created_at", "updated_at", "status", "mode"]
         read_only_fields = fields
 
 

src/backend/core/tests/recording/test_api_recordings_list.py

@@ -58,6 +58,7 @@ def test_api_recordings_list_authenticated_direct(role):
     assert results[0] == {
         "id": str(recording.id),
         "created_at": recording.created_at.isoformat().replace("+00:00", "Z"),
+        "mode": recording.mode,
         "room": {
             "access_level": str(room.access_level),
             "id": str(room.id),