fix: properly handle streaming state when api_req_started has no cost

When api_req_started exists without cost or cancelReason fields, the API request is still in progress and should be treated as streaming. Only return false when cost (completed) or cancelReason (cancelled) are present.

Author: daniel-lxs

webview-ui/src/components/chat/ChatView.tsx

@@ -560,6 +560,9 @@ const ChatViewComponent: React.ForwardRefRenderFunction<ChatViewRef, ChatViewPro
 					if ("cost" in info && info.cost !== undefined) {
 						return false // API request has finished.
 					}
+
+					// If we have api_req_started without cost or cancelReason, streaming is in progress
+					return true
 				}
 			}
 		}