Fix test: align remote.mode in no-reload settings test

The default remote.mode changed from 'local' to 'byok', causing
the apply_settings test to detect a mode mismatch and trigger an
unexpected engine reload. Pin remote.mode to 'local' in the test
to match the controller's assumed current mode.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/tests/test_app_controller.py

@@ -125,6 +125,8 @@ def test_apply_settings_no_reload_when_same(controller):
     # Ensure config returns the same values
     controller.config.set("transcription.model", "base.en")
     controller.config.set("transcription.device", "auto")
+    # Remote mode must also match (no engine means current mode is 'local')
+    controller.config.set("remote.mode", "local")
 
     controller.reload_engine = MagicMock(return_value=(True, "reloaded"))