♻️(backend) fix Twirp error mocking in tests

Tests were incorrectly mocking Twirp errors using HTTP status
codes instead of the meaningful error codes returned by the
LiveKit SDK.

Update mocks to reflect actual SDK behavior.

CHANGELOG.md

@@ -19,12 +19,15 @@ and this project adheres to
 - ⬆️(backend) bump lodash from 4.17.23 to 4.18.1 in /src/mail
 - ⬆️(frontend) bump hono from 4.12.8 to 4.12.12 in /src/frontend
 - ⬆️(backend) bump pygments from 2.19.2 to 2.20.0 in /src/backend
+- ♻️(backend) use Authorization header for LiveKit token authentication 
+- 🥅(backend) refine Twirp error handling for participant operations
 
 ### Fixed
 
 - ⬆️(dependencies) update aiohttp to v3.13.4 [SECURITY]
 - ⬆️(dependencies) update vite to v7.3.2 [SECURITY]
 - ⬆️(dependencies) update django to v5.2.13 [SECURITY]
+- 🔒(backend) rely on backend to allow participant update their metadata
 
 ## [1.13.0] - 2026-03-31
 

src/backend/core/tests/rooms/test_api_rooms_participants_management.py

@@ -91,7 +91,7 @@ def test_mute_participant_unexpected_twirp_error(mock_livekit_client):
     client = APIClient()
 
     mock_livekit_client.room.mute_published_track.side_effect = TwirpError(
-        msg="Internal server error", code=500, status=500
+        msg="Internal server error", code="unknown", status=500
     )
 
     room = RoomFactory()
@@ -387,7 +387,7 @@ def test_update_participant_unexpected_twirp_error(mock_livekit_client):
     client = APIClient()
 
     mock_livekit_client.room.update_participant.side_effect = TwirpError(
-        msg="Internal server error", code=500, status=500
+        msg="Internal server error", code="unknown", status=500
     )
 
     room = RoomFactory()
@@ -526,7 +526,7 @@ def test_remove_participant_unexpected_twirp_error(mock_livekit_client):
     client = APIClient()
 
     mock_livekit_client.room.remove_participant.side_effect = TwirpError(
-        msg="Internal server error", code=500, status=500
+        msg="Internal server error", code="unknown", status=500
     )
 
     room = RoomFactory()

src/backend/core/tests/rooms/test_api_rooms_subtitle.py

@@ -172,7 +172,7 @@ def test_start_subtitle_twirp_error(
     client = APIClient()
 
     mock_livekit_client.agent_dispatch.create_dispatch.side_effect = TwirpError(
-        msg="Internal server error", code=500, status=500
+        msg="Internal server error", code="unknown", status=500
     )
 
     response = client.post(

src/backend/core/tests/services/test_telephony_service.py

@@ -72,7 +72,7 @@ def test_create_dispatch_rule_api_failure(mock_client_factory):
 
     mock_api = create_mock_livekit_client()
     mock_api.sip.create_sip_dispatch_rule = mock.AsyncMock(
-        side_effect=TwirpError(msg="Internal server error", code=500, status=500)
+        side_effect=TwirpError(msg="Internal server error", code="unknown", status=500)
     )
     mock_client_factory.return_value = mock_api
 
@@ -177,7 +177,7 @@ def test_list_dispatch_rules_ids_api_failure(mock_client_factory):
 
     mock_api = create_mock_livekit_client()
     mock_api.sip.list_sip_dispatch_rule = mock.AsyncMock(
-        side_effect=TwirpError(msg="Internal server error", code=500, status=500)
+        side_effect=TwirpError(msg="Internal server error", code="unknown", status=500)
     )
     mock_client_factory.return_value = mock_api
 
@@ -270,7 +270,7 @@ def test_delete_dispatch_rule_partial_failure(mock_client_factory, mock_list_rul
         if call_count == 0:
             call_count += 1
             return None
-        raise TwirpError(msg="Deletion failed", code=500, status=500)
+        raise TwirpError(msg="Deletion failed", code="unknown", status=500)
 
     mock_api.sip.delete_sip_dispatch_rule = mock.AsyncMock(
         side_effect=delete_side_effect
@@ -294,7 +294,7 @@ def test_delete_dispatch_rule_api_failure(mock_client_factory, mock_list_rules):
     mock_list_rules.return_value = ["rule-1"]
     mock_api = create_mock_livekit_client()
     mock_api.sip.delete_sip_dispatch_rule = mock.AsyncMock(
-        side_effect=TwirpError(msg="Internal server error", code=500, status=500)
+        side_effect=TwirpError(msg="Internal server error", code="unknown", status=500)
     )
     mock_client_factory.return_value = mock_api