fix: clear taskIds immediately on response done

Author: Algorithm5838

src/lib/components/chat/Chat.svelte

@@ -1450,8 +1450,6 @@
 				await chats.set(await getChatList(localStorage.token, $currentChatPage));
 			}
 		}
-
-		taskIds = null;
 	};
 
 	const chatActionHandler = async (_chatId, actionId, modelId, responseMessageId, event = null) => {
@@ -1793,6 +1791,14 @@
 				scrollToBottom();
 			}
 
+			const siblingIds =
+				message.parentId && history.messages[message.parentId]
+					? history.messages[message.parentId].childrenIds
+					: [message.id];
+			if (siblingIds.every((id) => history.messages[id]?.done === true)) {
+				taskIds = null;
+			}
+
 			// Fire-and-forget: run chatCompletedHandler for background work
 			// (outlet filters, chat save, title gen, follow-ups, tags)
 			// without blocking the user from sending new messages.