Fix live activity streaming and replay summary

frontend/app/components/assistant-ui/activity-panel.tsx

@@ -979,6 +979,10 @@ function summarizeLiveRunEvents(
 		if (event.type === "run_started") {
 			lines.push("后端已开始执行本轮任务。");
 		}
+		if (event.type === "content_delta" && event.delta) {
+			const note = event.delta.trim();
+			if (note && !isNoisyLiveDelta(note)) lines.push(note);
+		}
 		if (event.type === "tool_start") {
 			const stageNote =
 				typeof event.assistant_content === "string"
@@ -994,6 +998,9 @@ function summarizeLiveRunEvents(
 				event.tool_name ? `工具完成 ${event.tool_name}` : "工具调用完成",
 			);
 		}
+		if (event.type === "tool_delta") {
+			lines.push(event.tool_name ? `${event.tool_name} 输出中` : "工具输出中");
+		}
 		if (event.type === "final_text_start") {
 			lines.push("正在整理回复");
 		}
@@ -1011,6 +1018,10 @@ function summarizeLiveRunEvents(
 	return lines.slice(-40);
 }
 
+function isNoisyLiveDelta(value: string) {
+	return value === "。" || value === "，" || value === "," || value.length <= 1;
+}
+
 function collectActivityItems(messages: readonly MessageState[]) {
 	const items: ActivityItem[] = [];