优化 Agent 过程展示，增加时间格式化和状态管理

src/lib/chatStream.ts

@@ -3,7 +3,7 @@ import { config } from "@config/config";
 
 export type StreamEvent =
   | { type: "token"; sessionId: string; content: string }
-  | { type: "done"; sessionId: string }
+  | { type: "done"; sessionId: string; totalDurationMs?: number }
   | { type: "session_title"; sessionId: string; title: string }
   | {
       type: "progress";
@@ -13,12 +13,17 @@ export type StreamEvent =
       status: "running" | "completed" | "error";
       title: string;
       detail?: string;
+      startedAt?: number;
+      endedAt?: number;
+      elapsedMs?: number;
+      durationMs?: number;
     }
   | {
       type: "error";
       sessionId?: string;
       message: string;
       detail?: string;
+      totalDurationMs?: number;
     }
   | {
       type: "tool_call";
@@ -162,6 +167,11 @@ export const streamAgentChat = async ({
           phase?: string;
           status?: "running" | "completed" | "error";
           title?: string;
+          started_at?: number;
+          ended_at?: number;
+          elapsed_ms?: number;
+          duration_ms?: number;
+          total_duration_ms?: number;
         };
         if (event === "token") {
           onEvent({
@@ -178,11 +188,16 @@ export const streamAgentChat = async ({
             status: parsed.status ?? "running",
             title: parsed.title ?? "正在处理",
             detail: parsed.detail,
+            startedAt: parsed.started_at,
+            endedAt: parsed.ended_at,
+            elapsedMs: parsed.elapsed_ms,
+            durationMs: parsed.duration_ms,
           });
         } else if (event === "done") {
           onEvent({
             type: "done",
             sessionId: parsed.session_id ?? "",
+            totalDurationMs: parsed.total_duration_ms,
           });
         } else if (event === "session_title") {
           onEvent({
@@ -196,6 +211,7 @@ export const streamAgentChat = async ({
             sessionId: parsed.session_id,
             message: parsed.message ?? "unknown error",
             detail: parsed.detail,
+            totalDurationMs: parsed.total_duration_ms,
           });
         } else if (event === "tool_call") {
           onEvent({