fix: reset taskId after conversation to prevent incorrect cancellation behavior

src/lib/components/chat/Chat.svelte

@@ -887,6 +887,8 @@
 				await chats.set(await getChatList(localStorage.token, $currentChatPage));
 			}
 		}
+		
+		taskId = null
 	};
 
 	const chatActionHandler = async (chatId, actionId, modelId, responseMessageId, event = null) => {