fix: Correct sync trigger types from manual to scheduled/retry.

Fixed scheduled syncs being incorrectly saved as "manual" in database.
Now properly identifies scheduled syncs as "scheduled" and retry
attempts as "retry". Updated frontend to capitalize trigger type
badges for better display.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

leggen/api/models/sync.py

@@ -18,7 +18,7 @@ class SyncOperation(BaseModel):
     duration_seconds: Optional[float] = None
     errors: list[str] = []
     logs: list[str] = []
-    trigger_type: str = "manual"  # manual, scheduled, api
+    trigger_type: str = "manual"  # manual, scheduled, retry, api
 
     class Config:
         json_encoders = {datetime: lambda v: v.isoformat() if v else None}