Fix unused imports and clean up ruff warnings

Author: AdirAmsalem

test_ui.py

@@ -14,7 +14,6 @@
 from pathlib import Path
 from typing import Optional
 import tempfile
-import os
 
 # Import the SDK
 from decart import DecartClient, models
@@ -297,7 +296,7 @@ def on_status_change(job):
 
         with tempfile.NamedTemporaryFile(suffix=".mp4", delete=False) as f:
             f.write(result.data)
-            return f.name, f"Success! Generated video from image"
+            return f.name, "Success! Generated video from image"
 
     except Exception as e:
         return None, f"Error: {str(e)}"

tests/test_realtime_unit.py

@@ -1188,7 +1188,7 @@ async def test_subscribe_mode_skips_passthrough():
         mock_manager_class.return_value = mock_manager
 
         # subscribe() passes local_track=None internally
-        from decart.realtime.subscribe import SubscribeClient, encode_subscribe_token
+        from decart.realtime.subscribe import encode_subscribe_token
 
         token = encode_subscribe_token("test-sid", "1.2.3.4", 8080)