diff --git a/apps/ai-game-creator-shell/tests/resourceCanvasGenerationHostLifecycle.test.tsx b/apps/ai-game-creator-shell/tests/resourceCanvasGenerationHostLifecycle.test.tsx
new file mode 100644
index 000000000..a2371b674
--- /dev/null
+++ b/apps/ai-game-creator-shell/tests/resourceCanvasGenerationHostLifecycle.test.tsx
@@ -0,0 +1,461 @@
+/** @vitest-environment jsdom */
+
+import { afterEach, describe, expect, test, vi } from 'vitest';
+
+import type {
+  GameCreationAppAssetManifestEntry,
+  GameCreationAppManifest,
+  ProjectResourceCanvasPosition,
+} from '../../../packages/shared/src/contracts/gameCreationApp';
+import ProjectDevelopmentView from '../src/view/project-development';
+import {
+  act,
+  cleanup,
+  createGameCreationAppManifest,
+  fireEvent,
+  React,
+  render,
+  screen,
+  waitFor,
+} from './appSurface/harness';
+
+/**
+ * 画布生成入口的**宿主生命周期**验收（真实 `ProjectDevelopmentView`，不做 props mock）。
+ *
+ * 覆盖三件事——它们都在宿主里（占位、提交身份、落点 effect），单测模型或组件看不到：
+ * 1. 音频 / 背景音乐入口：点工具立刻出占位，提交后那张占位进入 `submitted`；
+ * 2. 失败后用同一份请求重试：复用**同一个 operationId / 幂等键**，不会变成新的付费生成；
+ * 3. 成功后结果卡落到占位**最新位置**、占位被撤掉（结果接管它的位置）。
+ *
+ * 原生命令全部走本文件的假实现，不触发任何真实 Provider 调用。
+ */
+
+const PROJECT_ID = 'generation-host-project';
+const PROJECT_PATH = '/tmp/generation-host-project';
+const NEW_ASSET_ID = 'asset-bgm-1';
+const NEW_RESOURCE_ID = `asset:${NEW_ASSET_ID}`;
+
+type AssetFixture = GameCreationAppAssetManifestEntry;
+type LayoutWrite = {
+  projectPath: string;
+  mode: string;
+  positions: ProjectResourceCanvasPosition[];
+};
+
+function imageAsset(id: string, fileName: string): AssetFixture {
+  return {
+    id,
+    kind: 'character',
+    category: 'character',
+    mediaType: 'image/png',
+    localPath: `assets/${fileName}`,
+    source: { kind: 'generated', resourceId: `${id}-resource` },
+  };
+}
+
+function bgmAsset(id: string): AssetFixture {
+  return {
+    id,
+    kind: 'background-music',
+    category: 'audio',
+    mediaType: 'audio/mpeg',
+    localPath: 'assets/bgm.mp3',
+    source: { kind: 'generated', resourceId: `${id}-resource` },
+  };
+}
+
+function seedBgmAsset(id: string): AssetFixture {
+  return { ...bgmAsset(id), localPath: `assets/${id}.mp3` };
+}
+
+function manifestFor(
+  projectId: string,
+  assets: AssetFixture[],
+): GameCreationAppManifest {
+  return {
+    ...createGameCreationAppManifest(projectId, `${projectId} 项目`),
+    assets: assets.map((asset) => structuredClone(asset)),
+  };
+}
+
+/**
+ * 只铺这条链路真正用到的本地命令；未知命令返回 `undefined` 并记账（不抛错），
+ * 免得画布里别的入口多调一个命令就把这组用例整体带红。
+ */
+function installHostTauri(options: {
+  assets: AssetFixture[];
+  deriveResults: Array<
+    | { ok: true; assetId: string; hold?: boolean }
+    | { ok: false; message: string }
+  >;
+}) {
+  const layoutWrites: LayoutWrite[] = [];
+  const deriveCalls: Array<Record<string, unknown>> = [];
+  const unexpectedCommands: string[] = [];
+  let revision = 0;
+  let releaseHeldDerive: (() => void) | null = null;
+  const positions: ProjectResourceCanvasPosition[] = [];
+
+  const invoke = vi.fn(async (command: string, args?: Record<string, unknown>) => {
+    if (command === 'get_local_game_project_revision') {
+      return { revision: 1 };
+    }
+    if (command === 'read_local_project_resource_graph') {
+      return {
+        nodes: [],
+        taskFlowIds: [],
+        producerAssignments: [],
+        dependencyDepths: options.assets.map((asset) => ({
+          resourceId: `asset:${asset.id}`,
+          dependencyDepth: 0,
+        })),
+        unresolvedReferenceResourceIds: [],
+        cyclicResourceIds: [],
+        cyclicTaskIds: [],
+        producerMappingTruncated: false,
+      };
+    }
+    if (command === 'read_local_project_resource_canvas_layout') {
+      return {
+        schemaVersion: 'game-creator-resource-layout.v1',
+        projectId: PROJECT_ID,
+        mode: String(args?.mode ?? ''),
+        revision,
+        positions: structuredClone(positions),
+        updatedAt: 0,
+      };
+    }
+    if (command === 'update_local_project_resource_canvas_layout') {
+      const next = structuredClone(
+        (args?.positions ?? []) as ProjectResourceCanvasPosition[],
+      );
+      positions.length = 0;
+      positions.push(...next);
+      revision += 1;
+      layoutWrites.push({
+        projectPath: String(args?.projectPath ?? ''),
+        mode: String(args?.mode ?? ''),
+        positions: next,
+      });
+      return {
+        status: 'updated',
+        layout: {
+          schemaVersion: 'game-creator-resource-layout.v1',
+          projectId: PROJECT_ID,
+          mode: String(args?.mode ?? ''),
+          revision,
+          positions: next,
+          updatedAt: revision,
+        },
+      };
+    }
+    if (command === 'derive_local_project_resource') {
+      const input = args?.input as Record<string, unknown>;
+      deriveCalls.push(input);
+      const planned = options.deriveResults.shift();
+      if (!planned || !planned.ok) {
+        throw new Error(planned?.message ?? '测试：没有预置生成结果');
+      }
+      // `hold`：把这次生成停在后台运行中，用来观察占位的 `submitted` 中间态。
+      if (planned.hold) {
+        await new Promise<void>((resolve) => {
+          releaseHeldDerive = resolve;
+        });
+      }
+      const asset = bgmAsset(planned.assetId);
+      return {
+        asset,
+        manifest: manifestFor(PROJECT_ID, [...options.assets, asset]),
+        committedProjectRevision: 2,
+        operationId: input.operationId,
+      };
+    }
+    if (command === 'list_pending_local_project_resource_edits') {
+      return [];
+    }
+    if (command === 'list_local_project_asset_generations') {
+      return [];
+    }
+    if (command === 'read_local_project_image_preview') {
+      return {
+        path: String(args?.relativePath ?? ''),
+        mediaType: 'image/png',
+        byteLen: 1,
+        dataUrl: 'data:image/png;base64,AA==',
+      };
+    }
+    if (command === 'read_local_project_text_preview') {
+      return {
+        path: String(args?.relativePath ?? ''),
+        mediaType: 'text/markdown',
+        byteLen: 2,
+        content: '#',
+      };
+    }
+    unexpectedCommands.push(command);
+    return undefined;
+  });
+
+  window.__TAURI__ = { core: { invoke } } as unknown as typeof window.__TAURI__;
+  return {
+    invoke,
+    layoutWrites,
+    deriveCalls,
+    unexpectedCommands,
+    releaseHeldDerive: () => releaseHeldDerive?.(),
+  };
+}
+
+function HostWorkbench({ assets }: { assets: AssetFixture[] }) {
+  const [manifest, setManifest] = React.useState<GameCreationAppManifest>(() =>
+    manifestFor(PROJECT_ID, assets),
+  );
+  return (
+    <ProjectDevelopmentView
+      projectName={manifest.name}
+      projectPath={PROJECT_PATH}
+      manifest={manifest}
+      attachments={[]}
+      recentRunStatus={null}
+      recentRunStopReason={null}
+      supervisor={<div>Supervisor</div>}
+      onHomeOpen={() => undefined}
+      onProjectsOpen={() => undefined}
+      onManifestChange={(_path, nextManifest) => setManifest(nextManifest)}
+    />
+  );
+}
+
+async function settle() {
+  await act(async () => {
+    await Promise.resolve();
+    await Promise.resolve();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+  });
+}
+
+function placeholderElement(draftId: string) {
+  return document.querySelector<HTMLElement>(
+    `[data-resource-canvas-generation-placeholder="${draftId}"]`,
+  );
+}
+
+function allPlaceholders() {
+  return Array.from(
+    document.querySelectorAll<HTMLElement>(
+      '[data-resource-canvas-generation-placeholder]',
+    ),
+  );
+}
+
+/**
+ * 音频入口只在「音频」栏目页出现（`RESOURCE_CANVAS_BOTTOM_TOOLS_BY_CATEGORY.audio`），
+ * 所以先打开音频栏目、再点「生成背景音乐」：占位立刻出现在该栏目里。
+ */
+async function openBgmEntry() {
+  const opener = screen
+    .getAllByRole('button')
+    .find((button) => /^打开音频/.test(button.textContent?.trim() ?? ''));
+  if (!opener) {
+    throw new Error(
+      `没找到音频栏目入口，现有入口：${screen
+        .getAllByRole('button')
+        .map((button) => button.textContent?.trim())
+        .filter((text) => text?.startsWith('打开'))
+        .join(' / ')}`,
+    );
+  }
+  fireEvent.click(opener);
+  await settle();
+  // 切到「按类型」：落点 effect 走的是**当前排序模式**那一侧的布局 hook，
+  // 类型侧的 sidecar 读完之后才 ready（依赖侧还要等关系图就绪）。
+  fireEvent.click(screen.getByRole('button', { name: '按类型' }));
+  await settle();
+  fireEvent.click(screen.getByRole('button', { name: '生成背景音乐' }));
+  await settle();
+  const placeholder = allPlaceholders()[0];
+  if (!placeholder) {
+    throw new Error('点音频入口后没有出现占位卡');
+  }
+  const draftId =
+    placeholder.dataset.resourceCanvasGenerationPlaceholder ?? '';
+  const prompt = document.querySelector<HTMLTextAreaElement>(
+    'textarea',
+  ) as HTMLTextAreaElement;
+  if (prompt) {
+    fireEvent.change(prompt, { target: { value: '一段平静的夜晚钢琴曲' } });
+  }
+  return { draftId, placeholder };
+}
+
+/**
+ * 占位卡在画布世界坐标里的落点。宿主不是把它写进 DOM 数据集，而是由外层包装的
+ * transform 决定位置——按 ManualLayout 用例的同一口径从 style 里取数。
+ */
+function placeholderWorldPoint(element: HTMLElement) {
+  const styled = element.closest<HTMLElement>('[style*="translate"]');
+  const source = styled?.style.transform ?? '';
+  const [x, y] = Array.from(
+    source.matchAll(/-?\d+(?:\.\d+)?/g),
+    (match) => Number(match[0]),
+  );
+  return { x, y };
+}
+
+function cardElement(resourceId: string) {
+  return document.querySelector<HTMLElement>(
+    `.game-resource-card[data-resource-card-id="${resourceId}"]`,
+  );
+}
+
+/**
+ * 占位的**局部落点**由占位模型给定：这一栏已有素材（种子卡在原点）时，占位排到它下方
+ * 一行（`placeResourceCanvasGenerationPlaceholder`：x 贴左边、y = 最高下沿 + 间距）。
+ *
+ * 尺寸从种子卡画出来的盒子里读，避免在用例里再抄一份卡片尺寸常量。
+ */
+function placeholderLocalPoint(placeholder: HTMLElement) {
+  const seed = cardElement('asset:seed-bgm');
+  if (!seed) {
+    throw new Error('没找到音频栏目里的种子卡');
+  }
+  const wrapper = seed.closest<HTMLElement>('[style*="translate"]');
+  const style = wrapper?.getAttribute('style') ?? '';
+  const height = Number(
+    style.match(/height:\s*(-?\d+(?:\.\d+)?)px/)?.[1] ?? Number.NaN,
+  );
+  if (!Number.isFinite(height)) {
+    throw new Error(`种子卡没有可读的高度：${style}`);
+  }
+  expect(placeholder).not.toBeNull();
+  return { x: 0, y: height + 16 };
+}
+
+/**
+ * 面板里的提交按钮：它与底部工具栏的工具按钮**同名**（都是「生成背景音乐」），
+ * 所以要排掉工具栏那一支，否则点的是工具本身（再点一次入口，不会提交）。
+ */
+function panelSubmitButton(label: string) {
+  const submit = screen
+    .getAllByRole('button', { name: label })
+    .find((button) => !button.closest('.game-resource-bottom-toolbar'));
+  if (!submit) {
+    throw new Error(`没找到面板里的提交按钮「${label}」`);
+  }
+  return submit;
+}
+
+afterEach(() => {
+  cleanup();
+  delete (
+    window as unknown as { __TAURI__?: unknown }
+  ).__TAURI__;
+  vi.restoreAllMocks();
+});
+
+describe('画布生成入口的宿主生命周期', () => {
+  test('音频入口：提交后占位进入 submitted，成功后结果落到占位最新位置并撤掉占位', async () => {
+    const tauri = installHostTauri({
+      assets: [seedBgmAsset('seed-bgm')],
+      deriveResults: [{ ok: true, assetId: NEW_ASSET_ID, hold: true }],
+    });
+    render(<HostWorkbench assets={[seedBgmAsset('seed-bgm')]} />);
+    await settle();
+
+    const { draftId, placeholder } = await openBgmEntry();
+    const placeholderPoint = placeholderLocalPoint(placeholder);
+    // 点入口只造占位：还没提交，也没发起任何生成。
+    expect(placeholder.dataset.resourceCanvasGenerationPlaceholderStatus).toBe(
+      'draft',
+    );
+    expect(tauri.deriveCalls).toEqual([]);
+
+    fireEvent.click(panelSubmitButton('生成背景音乐'));
+    await settle();
+
+    // 提交一次：走无源生成（create）链路；后台还在跑，占位收口为 submitted。
+    expect(tauri.deriveCalls).toHaveLength(1);
+    expect(tauri.deriveCalls[0]).toMatchObject({
+      editKind: 'background-music',
+      generationMode: 'create',
+      expectedProjectId: PROJECT_ID,
+    });
+    await waitFor(() =>
+      expect(
+        placeholderElement(draftId)?.dataset
+          .resourceCanvasGenerationPlaceholderStatus,
+      ).toBe('submitted'),
+    );
+
+    // 放行后台任务：结果入库。
+    await act(async () => {
+      tauri.releaseHeldDerive();
+      await Promise.resolve();
+    });
+
+    // 结果入库后：新卡落在占位坐标上（占位在空栏目里落在原点），占位被撤掉。
+    await waitFor(() => {
+      expect(
+        tauri.layoutWrites
+          .filter((write) =>
+            write.positions.some(
+              (position) => position.resourceId === NEW_RESOURCE_ID,
+            ),
+          )
+          .map(
+            (write) => {
+              const landed = write.positions.find(
+                (position) => position.resourceId === NEW_RESOURCE_ID,
+              )!;
+              return `${write.mode}:${landed.section}@${landed.x},${landed.y}${
+                landed.manuallyPlaced ? 'M' : 'A'
+              }`;
+            },
+          )
+          .join(' || '),
+      ).toContain(
+        `type:audio@${placeholderPoint.x},${placeholderPoint.y}M`,
+      );
+    });
+    await waitFor(() => expect(allPlaceholders()).toHaveLength(0));
+  });
+
+  test('失败后用同一份请求重试：复用同一个 operationId 与幂等键', async () => {
+    const tauri = installHostTauri({
+      assets: [seedBgmAsset('seed-bgm')],
+      deriveResults: [
+        { ok: false, message: 'result-unknown: 测试网络中断' },
+        { ok: true, assetId: NEW_ASSET_ID },
+      ],
+    });
+    render(<HostWorkbench assets={[seedBgmAsset('seed-bgm')]} />);
+    await settle();
+
+    const { draftId } = await openBgmEntry();
+    fireEvent.click(panelSubmitButton('生成背景音乐'));
+    await settle();
+    expect(tauri.deriveCalls).toHaveLength(1);
+    // 失败：占位留着（输入与操作身份都还在），状态收口为 failed。
+    await waitFor(() =>
+      expect(
+        placeholderElement(draftId)?.dataset
+          .resourceCanvasGenerationPlaceholderStatus,
+      ).toBe('failed'),
+    );
+
+    // 面板上的原请求重试：同一次生成，不该变成第二次付费请求。
+    const retry = screen
+      .getAllByRole('button')
+      .find((button) => button.textContent?.includes('重试'));
+    expect(retry).toBeDefined();
+    fireEvent.click(retry!);
+    await settle();
+
+    await waitFor(() => expect(tauri.deriveCalls).toHaveLength(2));
+    expect(tauri.deriveCalls[1]).toMatchObject({
+      operationId: tauri.deriveCalls[0]!.operationId,
+      idempotencyKey: tauri.deriveCalls[0]!.idempotencyKey,
+      prompt: tauri.deriveCalls[0]!.prompt,
+    });
+  });
+});