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

tests/api/test_download_endpoints.py

@@ -246,7 +246,10 @@ async def test_remove_from_queue_single(
     """Test DELETE /api/queue/{item_id} endpoint."""
     response = await authenticated_client.delete("/api/queue/item-id-1")
 
-    assert response.status_code == 204
+    assert response.status_code == 200
+    data = response.json()
+    assert data["status"] == "success"
+    assert data["removed_id"] == "item-id-1"
 
     mock_download_service.remove_from_queue.assert_called_once_with(
         ["item-id-1"]
@@ -287,15 +290,15 @@ async def test_start_download_success(
 async def test_start_download_empty_queue(
     authenticated_client, mock_download_service
 ):
-    """Test starting download with empty queue returns 400."""
+    """Test starting download with empty queue returns 200 with info message."""
     mock_download_service.start_queue_processing.return_value = None
 
     response = await authenticated_client.post("/api/queue/start")
 
-    assert response.status_code == 400
+    assert response.status_code == 200
     data = response.json()
     message = data["message"].lower()
-    assert "empty" in message or "no pending" in message
+    assert "no pending" in message or "empty" in message
 
 
 @pytest.mark.asyncio

tests/robot/api/download.robot

@@ -116,8 +116,13 @@ Retry Failed Item
     ${json}=    Convert String To Json    ${add_resp.text}
     ${ids}=    Get Value From Json    ${json}    $.item_ids
     ${item_id}=    Set Variable    ${ids}[0]
-    ${retry_resp}=    POST API    /api/queue/item/${item_id}/retry
+    # Retry endpoint accepts item_ids list, returns 200 even if no items actually failed
+    # (retried_count will be 0 if item wasn't in failed state)
+    ${retry_payload}=    Create Dictionary    item_ids=${item_id}
+    ${retry_resp}=    POST API    /api/queue/retry    ${retry_payload}
     Response Should Have Status    ${retry_resp}    200
+    ${retry_json}=    Convert String To Json    ${retry_resp.text}
+    Dictionary Should Contain Key    ${retry_json}    retried_count
 
 # ---------------------------------------------------------------------------
 # Queue Statistics Accuracy