diff --git a/apps/ai-game-creator-shell/src-tauri/src/preview.rs b/apps/ai-game-creator-shell/src-tauri/src/preview.rs
index 528b3a386..4e9d00bda 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/preview.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/preview.rs
@@ -758,7 +758,14 @@ pub(crate) fn start_local_game_preview_at_revision(
     }
     let (preview, previous_preview) = registry.set_running(preview, stop);
     if let Some(previous_preview) = previous_preview.as_ref() {
-        record_replaced_preview_stop(previous_preview);
+        // 同一个项目重启预览（换监听线程、换端口）时，旧的 registry 身份与新预览共享
+        // 同一份落盘记录：上面刚写进去的是 running，这里若再用旧预览收尾，就会把它覆盖
+        // 成 stopped，下次进项目便丢掉"预览在跑"这条事实。只有旧预览属于**另一个项目**
+        // 时才替它收尾（那才是真的换项目）。
+        let previous_status = local_preview_status_from_result(previous_preview);
+        if ensure_preview_belongs_to_project(&previous_status, root).is_err() {
+            record_replaced_preview_stop(previous_preview);
+        }
     }
     if let Err(error) = append_preview_start_trace_step(root, &preview) {
         let _ = registry.stop();
@@ -792,11 +799,23 @@ pub(crate) fn stop_local_game_preview_for_root(
     registry: &PreviewRegistry,
 ) -> Result<LocalPreviewStatus, String> {
     let (status, stopped) = registry.stop_for_project(root);
-    if let Some(root) = root.filter(|_| stopped) {
-        record_preview_state(root, GameCreationAppPreviewStatus::Stopped, None, None)?;
-        append_preview_log(root, "stopped", None)?;
-        append_preview_stop_trace_step(root)?;
+    let Some(root) = root else {
+        return Ok(status);
+    };
+    // 没有活体预览可停时，落盘记录仍可能是陈旧的 running：预览服务器是进程内线程、
+    // 非 Linux 端口还是随机临时端口，客户端退出后记录会一直写着 running。这时把记录
+    // 对齐成 stopped 才算真的"停"——否则下次进项目会照着陈旧记录渲染打不开的运行
+    // 界面（进入项目时的活体核对是第二道保险，记录本身也该在自己的生命周期里结束）。
+    let stale_record = !stopped
+        && read_manifest_for_project(root)?
+            .preview
+            .is_some_and(|preview| preview.status == GameCreationAppPreviewStatus::Running);
+    if !stopped && !stale_record {
+        return Ok(status);
     }
+    record_preview_state(root, GameCreationAppPreviewStatus::Stopped, None, None)?;
+    append_preview_log(root, "stopped", None)?;
+    append_preview_stop_trace_step(root)?;
     Ok(status)
 }
 
diff --git a/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs b/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs
index 048a20a18..ab4e1025f 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/tests/project.rs
@@ -4735,6 +4735,87 @@ fn stale_preview_cleanup_cannot_be_blocked_by_project_stop_policy() {
     fs::remove_dir_all(root).ok();
 }
 
+#[test]
+fn restarting_preview_for_the_same_project_keeps_the_running_record() {
+    let root = unique_project_path();
+    init_existing_html_project_at(&root, "project-1", "同项目重启预览记录测试")
+        .expect("project init");
+    let registry = PreviewRegistry::default();
+
+    let first = start_local_game_preview_at(&root, &registry).expect("first preview start");
+    let second = start_local_game_preview_at(&root, &registry).expect("second preview start");
+    assert_ne!(first.url, second.url, "重启必须换一个监听端口");
+
+    let manifest: Value =
+        serde_json::from_str(&fs::read_to_string(root.join(".agent/manifest.json")).unwrap())
+            .expect("manifest json");
+    assert_eq!(
+        manifest["preview"]["status"], "running",
+        "同一个项目重启预览不能让旧预览的收尾把刚写进去的 running 覆盖成 stopped"
+    );
+    assert_eq!(manifest["preview"]["port"], second.port);
+
+    let _ = registry.stop();
+    fs::remove_dir_all(root).ok();
+}
+
+#[test]
+fn replacing_preview_for_another_project_closes_the_previous_project_record() {
+    let first_root = unique_project_path();
+    let second_root = unique_project_path();
+    init_existing_html_project_at(&first_root, "project-1", "旧项目预览记录测试")
+        .expect("first project init");
+    init_existing_html_project_at(&second_root, "project-2", "新项目预览记录测试")
+        .expect("second project init");
+    let registry = PreviewRegistry::default();
+
+    let _first = start_local_game_preview_at(&first_root, &registry).expect("first preview");
+    let second = start_local_game_preview_at(&second_root, &registry).expect("second preview");
+
+    let previous_manifest: Value =
+        serde_json::from_str(&fs::read_to_string(first_root.join(".agent/manifest.json")).unwrap())
+            .expect("previous manifest json");
+    assert_eq!(
+        previous_manifest["preview"]["status"], "stopped",
+        "换项目时旧项目的落盘记录必须收尾"
+    );
+    let next_manifest: Value = serde_json::from_str(
+        &fs::read_to_string(second_root.join(".agent/manifest.json")).unwrap(),
+    )
+    .expect("next manifest json");
+    assert_eq!(next_manifest["preview"]["status"], "running");
+    assert_eq!(next_manifest["preview"]["port"], second.port);
+
+    let _ = registry.stop();
+    fs::remove_dir_all(first_root).ok();
+    fs::remove_dir_all(second_root).ok();
+}
+
+#[test]
+fn stopping_without_a_live_preview_still_reconciles_a_stale_running_record() {
+    let root = unique_project_path();
+    init_existing_html_project_at(&root, "project-1", "陈旧记录对齐测试").expect("project init");
+    // 模拟"上次留下的 running 记录"：直接写记录，registry 里没有任何活体预览。
+    record_preview_state(
+        &root,
+        GameCreationAppPreviewStatus::Running,
+        Some("http://127.0.0.1:3210/".to_string()),
+        Some(3210),
+    )
+    .expect("stale record");
+    let registry = PreviewRegistry::default();
+
+    let status = stop_local_game_preview_for_root(Some(&root), &registry).expect("reconcile");
+
+    assert_eq!(status, stopped_preview_status());
+    let manifest: Value =
+        serde_json::from_str(&fs::read_to_string(root.join(".agent/manifest.json")).unwrap())
+            .expect("manifest json");
+    assert_eq!(manifest["preview"]["status"], "stopped");
+
+    fs::remove_dir_all(root).ok();
+}
+
 #[test]
 fn local_preview_serves_generated_playable_game() {
     let root = unique_project_path();
diff --git a/apps/ai-game-creator-shell/src/features/app-shell/sessionPreview.ts b/apps/ai-game-creator-shell/src/features/app-shell/sessionPreview.ts
new file mode 100644
index 000000000..a9c37a2fc
--- /dev/null
+++ b/apps/ai-game-creator-shell/src/features/app-shell/sessionPreview.ts
@@ -0,0 +1,102 @@
+import type { GameCreationAppPreviewState } from '../../../../../packages/shared/src/contracts/gameCreationApp';
+
+/**
+ * 进入项目时的预览活体核验。
+ *
+ * 为什么不能直接信项目 manifest 里的 `preview`：那是"上次留下的一条记录"，不是"现在
+ * 有没有在跑"。本地预览服务器是**进程内线程**（`src-tauri/src/preview.rs` 的
+ * `thread::spawn` + loopback listener），非 Linux 平台端口还是**随机临时端口**
+ * （`bind_loopback_listener_with_linux_fallback` 里的 `TcpListener::bind(..., 0)`），
+ * 客户端一退 URL 就永久失效；而落盘记录会一直写着 `running`。照它渲染，用户就会被直接
+ * 丢进一个打不开的运行界面——这正是"有时候进项目看到的是运行界面"的成因。
+ *
+ * 所以进项目时问一次内存 registry（`get_local_game_preview_status`）：
+ * - 确实在跑 → 作为**本次会话的预览**交给工作台（工作台据此自动进运行视图）；
+ * - 没在跑但记录写着 running → 记录陈旧：把落盘记录对齐成 stopped（复用现役
+ *   `stop_local_game_preview`，它现在会把陈旧记录一并收尾），本次会话不带预览。
+ */
+export type SessionPreviewResolution = {
+  /** 本次会话可用的预览：只有内存 registry 里真的在跑才有值。 */
+  sessionPreview: GameCreationAppPreviewState | null;
+  /**
+   * 会话 manifest 里该投影成的预览状态；`null` 表示落盘记录与真相一致，不用改。
+   *
+   * 判定陈旧的同一刻就按真相投影（而不是等落盘写成功）：否则一份写不进去的陈旧记录
+   * （例如项目策略把 `preview.stop` 设成需确认）会让运行入口继续拿着一个打不开的 URL
+   * 渲染运行画面。落盘那份由这次写入、退出收尾或下次进入时的核对负责收敛。
+   */
+  manifestPreviewPatch: GameCreationAppPreviewState | null;
+};
+
+/** 预览命令的最小 invoke 形状（与 App 里 `window.__TAURI__.core.invoke` 一致）。 */
+export type PreviewCommandInvoke = <T>(
+  command: string,
+  args?: Record<string, unknown>,
+) => Promise<T>;
+
+type LocalPreviewStatusLike = {
+  status?: string | null;
+  url?: string | null;
+  port?: number | null;
+};
+
+function livePreviewFromStatus(
+  status: LocalPreviewStatusLike | null,
+): GameCreationAppPreviewState | null {
+  const url = typeof status?.url === 'string' ? status.url.trim() : '';
+  if (status?.status !== 'running' || !url) {
+    return null;
+  }
+  return {
+    status: 'running',
+    url,
+    port: typeof status.port === 'number' ? status.port : null,
+  };
+}
+
+export async function resolveSessionPreviewOnProjectOpen({
+  invoke,
+  projectPath,
+  recordedPreview,
+}: {
+  invoke: PreviewCommandInvoke | null | undefined;
+  projectPath: string;
+  recordedPreview: GameCreationAppPreviewState | null;
+}): Promise<SessionPreviewResolution> {
+  const trimmedProjectPath = projectPath.trim();
+  if (!invoke || !trimmedProjectPath) {
+    return { sessionPreview: null, manifestPreviewPatch: null };
+  }
+
+  let status: LocalPreviewStatusLike | null = null;
+  try {
+    status = await invoke<LocalPreviewStatusLike>(
+      'get_local_game_preview_status',
+      { projectPath: trimmedProjectPath },
+    );
+  } catch {
+    // 读不到 registry 就按"没有在跑"处理：宁可让用户点一下「运行」，也不要进一个
+    // 打不开的运行界面。
+    status = null;
+  }
+  const sessionPreview = livePreviewFromStatus(status);
+  if (sessionPreview) {
+    return { sessionPreview, manifestPreviewPatch: null };
+  }
+
+  if (recordedPreview?.status !== 'running') {
+    return { sessionPreview: null, manifestPreviewPatch: null };
+  }
+
+  try {
+    await invoke('stop_local_game_preview', {
+      projectPath: trimmedProjectPath,
+    });
+  } catch {
+    // 对齐落盘记录失败不改判：本次会话照样不把陈旧记录当活体用。
+  }
+  return {
+    sessionPreview: null,
+    manifestPreviewPatch: { status: 'stopped' },
+  };
+}
diff --git a/apps/ai-game-creator-shell/src/features/app-shell/useHomeProjectCreation.ts b/apps/ai-game-creator-shell/src/features/app-shell/useHomeProjectCreation.ts
index 854e8193b..f6f1ecdec 100644
--- a/apps/ai-game-creator-shell/src/features/app-shell/useHomeProjectCreation.ts
+++ b/apps/ai-game-creator-shell/src/features/app-shell/useHomeProjectCreation.ts
@@ -42,6 +42,7 @@ import {
   isAbsoluteProjectPath,
   projectPathHasControlCharacter,
 } from '../project-summary/projectSummary';
+import { resolveSessionPreviewOnProjectOpen } from './sessionPreview';
 
 type UseHomeProjectCreationOptions = {
   setStatus: Dispatch<SetStateAction<string>>;
@@ -175,15 +176,30 @@ export function useHomeProjectCreation({
     }
   }
 
-  function enterProjectDevelopment(context: LauncherProjectContext) {
-    setCurrentProjectContext(context);
+  async function enterProjectDevelopment(context: LauncherProjectContext) {
     /**
-     * 进项目时**不**把 manifest 里的 `preview` 当成本次会话的预览：那是"上次留下的一条
-     * 落盘记录"，预览服务器是进程内线程、非 Linux 端口还是随机临时端口，客户端退出后
-     * 记录仍会写着 running。会话预览只由活体确认（下一步的 registry 核对）或本次会话里
-     * 的 preview.start / preview.status 写入，见 `activeProjectPreview` 的其它赋值点。
+     * 会话预览只认"内存 registry 里真的还在跑"的那一个（见
+     * `resolveSessionPreviewOnProjectOpen`）。项目 manifest 里的 `preview` 是**落盘记录**、
+     * 不是活体：预览服务器是进程内线程、非 Linux 端口还是随机临时端口，客户端退出后记录
+     * 仍会写着 running，照它自动进运行视图就是给用户一个打不开的运行界面。
      */
-    setActiveProjectPreview(null);
+    const session = await resolveSessionPreviewOnProjectOpen({
+      invoke: resolveTauriInvoke(),
+      projectPath: context.projectPath,
+      recordedPreview: context.manifest.preview ?? null,
+    });
+    setCurrentProjectContext(
+      session.manifestPreviewPatch
+        ? {
+            ...context,
+            manifest: {
+              ...context.manifest,
+              preview: session.manifestPreviewPatch,
+            },
+          }
+        : context,
+    );
+    setActiveProjectPreview(session.sessionPreview);
     setAgentRuntimeSummaries([]);
     setAgentResults([]);
     setProjectPath(context.projectPath);
@@ -263,7 +279,7 @@ export function useHomeProjectCreation({
       result.projectPath,
       attachments,
     );
-    enterProjectDevelopment({
+    await enterProjectDevelopment({
       projectPath: result.projectPath,
       projectName:
         result.manifest.name || projectNameFromPath(result.projectPath),
@@ -399,7 +415,7 @@ export function useHomeProjectCreation({
         },
       );
       setStatus('已创建项目');
-      enterProjectDevelopment({
+      await enterProjectDevelopment({
         projectPath: result.projectPath,
         projectName:
           result.manifest.name || projectNameFromPath(result.projectPath),
@@ -484,7 +500,7 @@ export function useHomeProjectCreation({
         return;
       }
       setStatus('已打开项目');
-      enterProjectDevelopment({
+      await enterProjectDevelopment({
         projectPath: trimmedProjectPath,
         projectName:
           directoryStatus.projectName ||
diff --git a/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts b/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
index 8a074e1ba..4c291695d 100644
--- a/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
+++ b/apps/ai-game-creator-shell/tests/appSurface/project-development.suite.ts
@@ -6993,11 +6993,13 @@ export function registerProjectSupervisorSurfaceTests() {
         ([command]) => command === 'chat_with_game_creator_direct_codex',
       ),
     ).toHaveLength(2);
+    // 进入项目时按内存 registry 核对一次预览活体（有活体才作为会话预览）。
+    // 这里只核验、不启动：开始预览仍然只能由用户动作或 Agent 触发。
     expect(
       invoke.mock.calls.filter(
         ([command]) => command === 'get_local_game_preview_status',
       ),
-    ).toHaveLength(0);
+    ).toHaveLength(1);
     expect(
       invoke.mock.calls.filter(
         ([command]) => command === 'start_local_game_preview',
diff --git a/apps/ai-game-creator-shell/tests/sessionPreview.test.ts b/apps/ai-game-creator-shell/tests/sessionPreview.test.ts
new file mode 100644
index 000000000..5ec837e16
--- /dev/null
+++ b/apps/ai-game-creator-shell/tests/sessionPreview.test.ts
@@ -0,0 +1,158 @@
+import { describe, expect, it, vi } from 'vitest';
+
+import type { GameCreationAppPreviewState } from '../../../packages/shared/src/contracts/gameCreationApp';
+import { resolveSessionPreviewOnProjectOpen } from '../src/features/app-shell/sessionPreview';
+
+const projectPath = '/tmp/session-preview-project';
+
+function createInvoke(
+  responses: Record<string, unknown>,
+  calls: Array<[string, Record<string, unknown> | undefined]> = [],
+) {
+  return vi.fn(async (command: string, args?: Record<string, unknown>) => {
+    calls.push([command, args]);
+    if (!(command in responses)) {
+      throw new Error(`unexpected invoke ${command}`);
+    }
+    return responses[command];
+  });
+}
+
+describe('进入项目时的预览活体核验', () => {
+  it('registry 里没有活体时不给会话预览，并把陈旧的 running 记录对齐成 stopped', async () => {
+    const calls: Array<[string, Record<string, unknown> | undefined]> = [];
+    const invoke = createInvoke(
+      {
+        get_local_game_preview_status: {
+          status: 'stopped',
+          url: null,
+          port: null,
+          root: null,
+        },
+        stop_local_game_preview: {
+          status: 'stopped',
+          url: null,
+          port: null,
+          root: null,
+        },
+      },
+      calls,
+    );
+
+    const resolution = await resolveSessionPreviewOnProjectOpen({
+      invoke,
+      projectPath,
+      recordedPreview: {
+        status: 'running',
+        url: 'http://127.0.0.1:4173/',
+        port: 4173,
+      },
+    });
+
+    // 没有活体预览：本次会话不带预览（工作台因此不会自动进运行视图）。
+    expect(resolution.sessionPreview).toBeNull();
+    // 落盘记录被判陈旧，会话 manifest 立刻按真相投影。
+    expect(resolution.manifestPreviewPatch).toEqual({ status: 'stopped' });
+    expect(calls).toEqual([
+      ['get_local_game_preview_status', { projectPath }],
+      ['stop_local_game_preview', { projectPath }],
+    ]);
+  });
+
+  it('registry 确实在跑时只认活体，且不写落盘记录', async () => {
+    const calls: Array<[string, Record<string, unknown> | undefined]> = [];
+    const invoke = createInvoke(
+      {
+        get_local_game_preview_status: {
+          status: 'running',
+          url: 'http://127.0.0.1:5210/',
+          port: 5210,
+          root: projectPath,
+        },
+      },
+      calls,
+    );
+
+    const resolution = await resolveSessionPreviewOnProjectOpen({
+      invoke,
+      projectPath,
+      // 落盘记录落后于真相（例如同项目重启后记录没跟上）也不影响：活体说了算。
+      recordedPreview: { status: 'stopped' },
+    });
+
+    expect(resolution.sessionPreview).toEqual({
+      status: 'running',
+      url: 'http://127.0.0.1:5210/',
+      port: 5210,
+    });
+    expect(resolution.manifestPreviewPatch).toBeNull();
+    expect(calls).toEqual([['get_local_game_preview_status', { projectPath }]]);
+  });
+
+  it('registry 不可读时按没有在跑处理，不把落盘记录当活体', async () => {
+    const invoke = vi.fn(async (command: string) => {
+      if (command === 'get_local_game_preview_status') {
+        throw new Error('需要在陶泥儿客户端内运行');
+      }
+      return { status: 'stopped', url: null, port: null, root: null };
+    });
+
+    const resolution = await resolveSessionPreviewOnProjectOpen({
+      invoke,
+      projectPath,
+      recordedPreview: {
+        status: 'running',
+        url: 'http://127.0.0.1:4173/',
+        port: 4173,
+      },
+    });
+
+    expect(resolution.sessionPreview).toBeNull();
+    expect(resolution.manifestPreviewPatch).toEqual({ status: 'stopped' });
+  });
+
+  it('记录本来就不是 running 时只读活体，不发多余的停止命令', async () => {
+    const calls: Array<[string, Record<string, unknown> | undefined]> = [];
+    const invoke = createInvoke(
+      {
+        get_local_game_preview_status: {
+          status: 'stopped',
+          url: null,
+          port: null,
+          root: null,
+        },
+      },
+      calls,
+    );
+
+    const stoppedRecord: GameCreationAppPreviewState = { status: 'stopped' };
+    const resolution = await resolveSessionPreviewOnProjectOpen({
+      invoke,
+      projectPath,
+      recordedPreview: stoppedRecord,
+    });
+
+    expect(resolution).toEqual({
+      sessionPreview: null,
+      manifestPreviewPatch: null,
+    });
+    expect(calls).toEqual([['get_local_game_preview_status', { projectPath }]]);
+  });
+
+  it('没有 invoke（浏览器里跑）时不做任何请求', async () => {
+    const resolution = await resolveSessionPreviewOnProjectOpen({
+      invoke: null,
+      projectPath,
+      recordedPreview: {
+        status: 'running',
+        url: 'http://127.0.0.1:4173/',
+        port: 4173,
+      },
+    });
+
+    expect(resolution).toEqual({
+      sessionPreview: null,
+      manifestPreviewPatch: null,
+    });
+  });
+});
diff --git a/docs/prd/【AI游戏创作】项目开发工作台PRD-2026-07-20.md b/docs/prd/【AI游戏创作】项目开发工作台PRD-2026-07-20.md
index 82223966f..eb792cb71 100644
--- a/docs/prd/【AI游戏创作】项目开发工作台PRD-2026-07-20.md
+++ b/docs/prd/【AI游戏创作】项目开发工作台PRD-2026-07-20.md
@@ -143,11 +143,11 @@
 ### 4.1 主视窗
 
 ```text
-resource-overview
+resource-overview（进入项目的初始态）
   -> resource-editor.derive（静态图片、SVG、视频、音频、文档/代码、Agent 回执“编辑资源”）
   -> resource-editor.version-branch（项目版本“编辑资源”）
   -> ui-editor（UI 原型与 UI 资源“编辑资源”）
-  -> run（存在 runnableVersion 且 loopback preview 可启动）
+  -> run（用户点运行入口/播放，或进入项目时内存 registry 确认预览仍在运行）
 
 resource-editor.* | ui-editor
   -> resource-overview（取消或保存投影完成）
@@ -162,7 +162,7 @@ run.paused
   -> resource-overview
 ```
 
-运行入口不可用时仍允许点击，显示“当前无可运行版本”，但不切换状态。素材创作的完整 opening/editing/generating/saving/cancelling/failed/recovering 状态、草稿身份和迟到结果门禁以 [`【技术方案】客户端素材创作无限画布阶段一合同-2026-08-05.md`](../technical/【技术方案】客户端素材创作无限画布阶段一合同-2026-08-05.md) 为准。
+进入项目时一律先落到 `resource-overview`。`run` 的自动进入只认内存 registry 的活体确认：只有本地预览服务器确实还在跑（`get_local_game_preview_status` 返回 `running`）才直接切过去。项目 manifest 里的 `preview` 是**落盘记录**而不是活体（预览服务器是进程内线程，非 Linux 平台端口还是随机临时端口），客户端退出后它会停留在 `running`；陈旧记录既不触发自动切换，也不允许被当成可运行预览渲染——进入项目时核对到记录陈旧就把它对齐成 `stopped`，客户端退出时也会统一停掉预览并收尾记录。运行入口不可用时仍允许点击，显示“当前无可运行版本”，但不切换状态。素材创作的完整 opening/editing/generating/saving/cancelling/failed/recovering 状态、草稿身份和迟到结果门禁以 [`【技术方案】客户端素材创作无限画布阶段一合同-2026-08-05.md`](../technical/【技术方案】客户端素材创作无限画布阶段一合同-2026-08-05.md) 为准。
 
 ### 4.2 测试切片