simplify queue ops, handle broken pipe errors

- Add OSError errno 32 (broken pipe) handling in progress broadcast
- Remove progress service calls from add/clear queue operations
- Add pending_by_episode cleanup on clear
- Update tests accordingly

src/server/api/download.py

@@ -229,7 +229,7 @@ async def clear_pending(
         )
 
 
-@router.delete("/{item_id}", status_code=status.HTTP_204_NO_CONTENT)
+@router.delete("/{item_id}", status_code=status.HTTP_200_OK)
 async def remove_from_queue(
     item_id: str = Path(..., description="Download item ID to remove"),
     _: dict = Depends(require_auth),
@@ -246,6 +246,9 @@ async def remove_from_queue(
     Args:
         item_id: Unique identifier of the download item to remove
 
+    Returns:
+        dict: Status message confirming removal
+
     Raises:
         HTTPException: 401 if not authenticated, 404 if item not found,
                       500 on service error
@@ -260,6 +263,12 @@ async def remove_from_queue(
                 resource_id=item_id
             )
 
+        return {
+            "status": "success",
+            "message": f"Removed item {item_id} from queue",
+            "removed_id": item_id,
+        }
+
     except DownloadServiceError as e:
         raise BadRequestError(message=str(e))
     except (BadRequestError, NotFoundError, ServerError):