feat: Enhance favorites functionality; add favorites filtering to playlists and sounds, and improve favorite indicators in responses

app/api/v1/sounds.py

@@ -8,7 +8,6 @@ from sqlmodel.ext.asyncio.session import AsyncSession
 from app.core.database import get_db, get_session_factory
 from app.core.dependencies import get_current_active_user_flexible
 from app.models.credit_action import CreditActionType
-from app.models.sound import Sound
 from app.models.user import User
 from app.repositories.sound import SortOrder, SoundRepository, SoundSortField
 from app.schemas.sound import SoundResponse, SoundsListResponse
@@ -87,7 +86,7 @@ async def get_sounds(  # noqa: PLR0913
             favorites_only=favorites_only,
             user_id=current_user.id,
         )
-        
+
         # Add favorite indicators for each sound
         sound_responses = []
         for sound in sounds:
@@ -95,7 +94,7 @@ async def get_sounds(  # noqa: PLR0913
             favorite_count = await favorite_service.get_sound_favorite_count(sound.id)
             sound_response = SoundResponse.from_sound(sound, is_favorited, favorite_count)
             sound_responses.append(sound_response)
-            
+
     except Exception as e:
         raise HTTPException(
             status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,