fix: close browser session lifecycle gaps

apps/web/src/App.tsx

@@ -14,6 +14,7 @@ import { HarnessClientStore } from "./store/harness-client-store.js";
 
 type AppStore = HarnessRuntimeStore & {
   start(): Promise<void>;
+  dispose?: () => Promise<void>;
   getModelConfig(): Promise<{ modelConfig: ModelView }>;
   putModelConfig?: (input: ModelConnectionInput) => Promise<{ modelConfig: ModelView }>;
   testModelConfig?: () => Promise<{ status: "ok" | "deferred"; message: string }>;
@@ -87,7 +88,17 @@ export function App({ store: suppliedStore, autoStart = true, modelConfigured: s
           modelLabel: model.modelId ?? "No model",
           supportsImages: model.supportsImages ?? false,
           onOpenSettings: () => setSettingsOpen(true),
-          onReset: () => window.location.reload(),
+          onReset: () => {
+            if (store.dispose === undefined) {
+              window.location.reload();
+              return;
+            }
+            void store.dispose()
+              .then(() => store.start())
+              .then(() => store.getModelConfig())
+              .then((response) => setModel(response.modelConfig))
+              .catch(() => undefined);
+          },
         }}
         skills={<SkillsPanel skills={snapshot.skills} />}
         chat={<Thread

apps/web/src/api/harness-api.ts

@@ -87,7 +87,7 @@ export class HarnessApi {
     const { body, ...init } = options;
     const isForm = body instanceof FormData;
     const headers = new Headers(init.headers);
-    if (!isForm) headers.set("Content-Type", "application/json");
+    if (body !== undefined && !isForm) headers.set("Content-Type", "application/json");
     const response = await fetch(`${this.baseUrl}${path}`, {
       ...init,
       headers,

apps/web/src/components/settings/ModelSettings.tsx

@@ -83,17 +83,17 @@ export function ModelSettings({ open, busy, current, onClose, onSave, onTest, on
           <button className="icon-button" type="button" aria-label="关闭模型设置" onClick={onClose}><X size={19} /></button>
         </div>
         <p className="settings-intro">密钥仅发送到本机服务并保存在当前会话内存中，不会写入浏览器存储。</p>
-        <form className="settings-form" onSubmit={(event) => void submit(event)}>
+        <form className="settings-form" autoComplete="off" onSubmit={(event) => void submit(event)}>
           <label>服务商<select ref={firstInput} value={providerId} onChange={(event) => {
             const value = event.target.value;
             setProviderId(value);
             setApi(value === "anthropic" ? "anthropic-messages" : "openai-responses");
           }}><option value="openai">OpenAI</option><option value="anthropic">Anthropic</option><option value="compatible">OpenAI Compatible</option></select></label>
           <label>API 类型<select value={api} onChange={(event) => setApi(event.target.value as ModelApi)}><option value="openai-responses">OpenAI Responses</option><option value="openai-completions">OpenAI Completions</option><option value="anthropic-messages">Anthropic Messages</option></select></label>
-          <label className="settings-form__wide">Base URL（可选）<input type="url" value={baseUrl} placeholder="https://api.example.com/v1" onChange={(event) => setBaseUrl(event.target.value)} /></label>
-          <label>模型 ID<input aria-label="模型 ID" required value={modelId} onChange={(event) => setModelId(event.target.value)} /></label>
+          <label className="settings-form__wide">Base URL（可选）<input name="agent-base-url" autoComplete="off" type="url" value={baseUrl} placeholder="https://api.example.com/v1" onChange={(event) => setBaseUrl(event.target.value)} /></label>
+          <label>模型 ID<input name="agent-model-id" autoComplete="off" aria-label="模型 ID" required value={modelId} onChange={(event) => setModelId(event.target.value)} /></label>
           <label>图片能力<select value={supportsImages ? "yes" : "no"} onChange={(event) => setSupportsImages(event.target.value === "yes")}><option value="yes">支持图片</option><option value="no">仅文本</option></select></label>
-          <label className="settings-form__wide">API Key<div className="password-field"><KeyRound size={17} /><input aria-label="API Key" type={reveal ? "text" : "password"} value={apiKey} autoComplete="off" onChange={(event) => setApiKey(event.target.value)} /><button type="button" aria-label={reveal ? "隐藏 API Key" : "显示 API Key"} onClick={() => setReveal((value) => !value)}>{reveal ? <EyeOff size={17} /> : <Eye size={17} />}</button></div></label>
+          <label className="settings-form__wide">API Key<div className="password-field"><KeyRound size={17} /><input name="agent-api-key" aria-label="API Key" type={reveal ? "text" : "password"} value={apiKey} autoComplete="new-password" onChange={(event) => setApiKey(event.target.value)} /><button type="button" aria-label={reveal ? "隐藏 API Key" : "显示 API Key"} onClick={() => setReveal((value) => !value)}>{reveal ? <EyeOff size={17} /> : <Eye size={17} />}</button></div></label>
           {saved?.keyHint === undefined ? null : <p className="key-hint">服务器中的密钥：<strong>{saved.keyHint}</strong></p>}
           {message === "" ? null : <p className="settings-message" role="status">{message}</p>}
           {busy ? <p className="settings-message settings-message--warning">运行期间不能更改模型配置</p> : null}

apps/web/src/store/harness-client-store.ts

@@ -38,6 +38,7 @@ export class HarnessClientStore {
   public async dispose(): Promise<void> {
     this.#eventSource?.close();
     this.#eventSource = undefined;
+    this.#starting = undefined;
     const sessionId = this.#state.sessionId;
     if (sessionId !== undefined) await this.api.deleteSession(sessionId);
     this.#setState(createInitialHarnessState());

apps/web/src/styles/layout.css

@@ -6,7 +6,7 @@
 .side-panel { display: flex; flex-direction: column; overflow: hidden; background: var(--surface); }
 .chat-panel { background: var(--bg); }
 .mobile-tabs { display: none; }
-@media (max-width: 1080px) {
+@media (min-width: 721px) and (max-width: 1080px) {
   .workspace-grid { grid-template-columns: minmax(210px, 240px) minmax(400px, 1fr); }
   .workspace-grid > div:last-child { display: none; }
 }

apps/web/tests/api.test.ts

@@ -0,0 +1,34 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { HarnessApi } from "../src/api/harness-api.js";
+
+afterEach(() => vi.unstubAllGlobals());
+
+describe("HarnessApi request headers", () => {
+  it("does not claim an empty POST contains JSON", async () => {
+    const fetchMock = vi.fn().mockResolvedValue(new Response(JSON.stringify({
+      sessionId: "ses_1",
+      requestId: "req_1",
+    }), { status: 201, headers: { "Content-Type": "application/json" } }));
+    vi.stubGlobal("fetch", fetchMock);
+
+    await new HarnessApi().createSession();
+
+    const request = fetchMock.mock.calls[0]?.[1] as RequestInit;
+    expect(new Headers(request.headers).has("Content-Type")).toBe(false);
+    expect(request.body).toBeUndefined();
+  });
+
+  it("sets JSON content type when a structured body is present", async () => {
+    const fetchMock = vi.fn().mockResolvedValue(new Response(JSON.stringify({
+      runId: "run_1",
+      requestId: "req_1",
+    }), { status: 202, headers: { "Content-Type": "application/json" } }));
+    vi.stubGlobal("fetch", fetchMock);
+
+    await new HarnessApi().sendMessage("ses_1", { text: "hello", attachmentIds: [] });
+
+    const request = fetchMock.mock.calls[0]?.[1] as RequestInit;
+    expect(new Headers(request.headers).get("Content-Type")).toBe("application/json");
+    expect(request.body).toBe(JSON.stringify({ text: "hello", attachmentIds: [] }));
+  });
+});

apps/web/tests/app-shell.test.tsx

@@ -1,7 +1,7 @@
 import { render, screen } from "@testing-library/react";
 import "@testing-library/jest-dom/vitest";
 import userEvent from "@testing-library/user-event";
-import { describe, expect, it, vi } from "vitest";
+import { afterEach, describe, expect, it, vi } from "vitest";
 import { App } from "../src/App.js";
 import { createInitialHarnessState, type HarnessClientState } from "../src/store/reducer.js";
 
@@ -24,6 +24,7 @@ function makeStore() {
     subscribe: () => () => undefined,
     sendMessage,
     cancel: vi.fn().mockResolvedValue({ cancelled: false }),
+    dispose: vi.fn().mockResolvedValue(undefined),
     start: vi.fn().mockResolvedValue(undefined),
     getModelConfig: vi.fn().mockResolvedValue({
       modelConfig: { configured: true, source: "environment", providerId: "openai", api: "openai-responses", modelId: "gpt-test", supportsImages: true },
@@ -31,6 +32,8 @@ function makeStore() {
   };
 }
 
+afterEach(() => vi.unstubAllGlobals());
+
 describe("App", () => {
   it("renders the three primary work areas", () => {
     render(<App store={makeStore()} autoStart={false} modelConfigured />);
@@ -55,4 +58,37 @@ describe("App", () => {
     expect(screen.getByRole("button", { name: "发送消息" })).toBeDisabled();
     expect(screen.getByText("请先配置模型连接")).toBeVisible();
   });
+
+  it("switches to the event timeline in the mobile tab layout", async () => {
+    vi.stubGlobal("matchMedia", vi.fn(() => ({
+      matches: true,
+      media: "(max-width: 720px)",
+      onchange: null,
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn(),
+      addListener: vi.fn(),
+      removeListener: vi.fn(),
+      dispatchEvent: vi.fn(),
+    })));
+    const user = userEvent.setup();
+    render(<App store={makeStore()} autoStart={false} modelConfigured />);
+
+    await user.click(screen.getByRole("tab", { name: "Events" }));
+
+    expect(screen.getByRole("tab", { name: "Events" })).toHaveAttribute("aria-selected", "true");
+    expect(screen.getByRole("region", { name: "Event Timeline" })).toBeVisible();
+    expect(screen.queryByRole("main", { name: "Streaming Chat" })).not.toBeInTheDocument();
+  });
+
+  it("deletes the old session before starting a reset session", async () => {
+    const user = userEvent.setup();
+    const store = makeStore();
+    render(<App store={store} autoStart={false} modelConfigured />);
+
+    await user.click(screen.getByRole("button", { name: "重置训练会话" }));
+
+    expect(store.dispose).toHaveBeenCalledTimes(1);
+    expect(store.start).toHaveBeenCalledTimes(1);
+    expect(store.dispose.mock.invocationCallOrder[0]).toBeLessThan(store.start.mock.invocationCallOrder[0] ?? 0);
+  });
 });

apps/web/tests/client-store.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, it, vi } from "vitest";
+import type { HarnessApi } from "../src/api/harness-api.js";
+import { HarnessClientStore } from "../src/store/harness-client-store.js";
+
+describe("HarnessClientStore lifecycle", () => {
+  it("deletes the current session and can start a fresh session after dispose", async () => {
+    const createSession = vi.fn()
+      .mockResolvedValueOnce({ sessionId: "ses_1", requestId: "req_1" })
+      .mockResolvedValueOnce({ sessionId: "ses_2", requestId: "req_2" });
+    const deleteSession = vi.fn().mockResolvedValue({ deleted: true, requestId: "req_delete" });
+    const api = {
+      createSession,
+      deleteSession,
+      getSkills: vi.fn().mockResolvedValue({ skills: [], requestId: "req_skills" }),
+      eventsUrl: (sessionId: string) => `/api/sessions/${sessionId}/events`,
+    } as unknown as HarnessApi;
+    const eventSources: Array<{ close: ReturnType<typeof vi.fn> }> = [];
+    const store = new HarnessClientStore(api, () => {
+      const source = { addEventListener: vi.fn(), close: vi.fn() };
+      eventSources.push(source);
+      return source;
+    });
+
+    await store.start();
+    expect(store.getSnapshot().sessionId).toBe("ses_1");
+    await store.dispose();
+    await store.start();
+
+    expect(deleteSession).toHaveBeenCalledWith("ses_1");
+    expect(createSession).toHaveBeenCalledTimes(2);
+    expect(eventSources[0]?.close).toHaveBeenCalledTimes(1);
+    expect(store.getSnapshot().sessionId).toBe("ses_2");
+  });
+});

apps/web/tests/settings.test.tsx

@@ -10,6 +10,8 @@ describe("ModelSettings", () => {
     const save = vi.fn().mockResolvedValue({ configured: true, source: "session", keyHint: "••••cret" });
     render(<ModelSettings open onClose={vi.fn()} busy={false} onSave={save} onTest={vi.fn()} onClear={vi.fn()} />);
 
+    expect(screen.getByLabelText("模型 ID")).toHaveAttribute("autocomplete", "off");
+    expect(screen.getByLabelText("API Key")).toHaveAttribute("autocomplete", "new-password");
     await user.type(screen.getByLabelText("API Key"), "sk-browser-secret");
     await user.type(screen.getByLabelText("模型 ID"), "gpt-test");
     await user.click(screen.getByRole("button", { name: "保存配置" }));