fix(frontend): filter task tool calls when rendering SubtaskCard (#1242)

Only tool calls with name === "task" should be rendered as SubtaskCard.
Previously all tool_calls were mapped to IDs, causing SubtaskCard to
render for non-task tool calls whose IDs were never registered in the
subtask context, resulting in a TypeError on task.status.

Signed-off-by: Gao Mingfei <g199209@gmail.com>
Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

frontend/src/components/workspace/messages/message-list.tsx

@@ -168,9 +168,9 @@ export function MessageList({
                   {t.subtasks.executing(tasks.size)}
                 </div>,
               );
-              const taskIds = message.tool_calls?.map(
+              const taskIds = message.tool_calls
-                (toolCall) => toolCall.id,
+                ?.filter((toolCall) => toolCall.name === "task")
-              );
+                .map((toolCall) => toolCall.id);
               for (const taskId of taskIds ?? []) {
                 results.push(
                   <SubtaskCard