Add favorites, effects badge on profiles, UI polish

- Add is_favorited column with toggle endpoint and star button on history
- Show sparkles icon on profile cards that have effects configured
- Gold ring on selected profile cards
- Smaller, gray action buttons with brighter hover
- Clamp player time to duration to prevent runaway playback
- Align profile card icon to top for wrapped names
- Flush bottom corners on history card when versions expanded
- Simplify .gitignore data/ rule

backend/models.py

@@ -79,6 +79,7 @@ class GenerationResponse(BaseModel):
     model_size: Optional[str] = None
     status: str = "completed"
     error: Optional[str] = None
+    is_favorited: bool = False
     created_at: datetime
     versions: Optional[List["GenerationVersionResponse"]] = None
     active_version_id: Optional[str] = None
@@ -110,6 +111,7 @@ class HistoryResponse(BaseModel):
     model_size: Optional[str] = None
     status: str = "completed"
     error: Optional[str] = None
+    is_favorited: bool = False
     created_at: datetime
     versions: Optional[List["GenerationVersionResponse"]] = None
     active_version_id: Optional[str] = None