添加进度面板，优化消息处理逻辑

src/lib/chatStream.test.ts

@@ -70,6 +70,33 @@ describe("streamAgentChat", () => {
     ]);
   });
 
+  it("parses progress events", async () => {
+    apiFetch.mockResolvedValue({
+      ok: true,
+      body: makeStream([
+        'event: progress\ndata: {"session_id":"s1","id":"p1","phase":"tool","status":"running","title":"正在调用后端数据查询","detail":"GET /api/v1/demo"}\n\n',
+        'event: done\ndata: {"session_id":"s1"}\n\n',
+      ]),
+    });
+
+    const events: Array<{ type: string; title?: string; status?: string; detail?: string }> = [];
+
+    await streamAgentChat({
+      message: "hi",
+      onEvent: (event) => events.push(event),
+    });
+
+    expect(events[0]).toEqual({
+      type: "progress",
+      sessionId: "s1",
+      id: "p1",
+      phase: "tool",
+      status: "running",
+      title: "正在调用后端数据查询",
+      detail: "GET /api/v1/demo",
+    });
+  });
+
   it("emits error when response is not ok", async () => {
     apiFetch.mockResolvedValue({
       ok: false,