fix(jump-hop): preserve themed runtime metadata

src/services/jump-hop/jumpHopClient.test.ts

@@ -37,3 +37,93 @@ test('jump hop creation keeps image2 generation requests alive long enough', asy
     }),
   );
 });
+
+test('jump hop work detail preserves flattened back button asset', async () => {
+  const backButtonAsset = {
+    assetId: 'back-button-1',
+    imageSrc: '/generated-jump-hop-assets/back-button-1.png',
+    imageObjectKey: 'jump-hop/back-button-1.png',
+    assetObjectId: 'asset-object-back-button-1',
+    generationProvider: 'image2',
+    prompt: '主题返回按钮',
+    width: 1024,
+    height: 1024,
+  };
+  const characterAsset = {
+    assetId: 'character-1',
+    imageSrc: 'builtin://jump-hop/default-character',
+    imageObjectKey: '',
+    assetObjectId: 'character-object-1',
+    generationProvider: 'builtin-three',
+    prompt: '内置默认角色',
+    width: 0,
+    height: 0,
+  };
+  const draft = {
+    templateId: 'jump-hop',
+    templateName: '跳一跳',
+    profileId: 'profile-1',
+    themeText: '森林茶馆',
+    workTitle: '森林茶馆跳一跳',
+    workDescription: '森林茶馆主题',
+    themeTags: ['森林茶馆', '跳一跳'],
+    difficulty: 'standard',
+    stylePreset: 'minimal-blocks',
+    defaultCharacter: null,
+    characterPrompt: '内置默认角色',
+    tilePrompt: '森林茶馆主题地块',
+    endMoodPrompt: null,
+    characterAsset,
+    tileAtlasAsset: characterAsset,
+    tileAssets: [],
+    path: {
+      seed: 'profile-1',
+      difficulty: 'standard',
+      platforms: [],
+      scoring: {
+        perfectRadiusRatio: 0.24,
+        hitRadiusRatio: 0.52,
+        maxChargeMs: 1200,
+        minChargeMs: 80,
+        maxJumpDistance: 5,
+      },
+    },
+    coverComposite: null,
+    backButtonAsset: null,
+    generationStatus: 'ready',
+  };
+  requestJsonMock.mockResolvedValue({
+    item: {
+      runtimeKind: 'jump-hop',
+      workId: 'work-1',
+      profileId: 'profile-1',
+      ownerUserId: 'owner-1',
+      sourceSessionId: 'session-1',
+      themeText: '森林茶馆',
+      workTitle: '森林茶馆跳一跳',
+      workDescription: '森林茶馆主题',
+      themeTags: ['森林茶馆', '跳一跳'],
+      difficulty: 'standard',
+      stylePreset: 'minimal-blocks',
+      coverImageSrc: null,
+      publicationStatus: 'published',
+      playCount: 0,
+      updatedAt: '2026-06-05T00:00:00Z',
+      publishedAt: '2026-06-05T00:00:00Z',
+      publishReady: true,
+      generationStatus: 'ready',
+      draft,
+      path: draft.path,
+      defaultCharacter: null,
+      characterAsset,
+      tileAtlasAsset: characterAsset,
+      tileAssets: [],
+      backButtonAsset,
+    },
+  });
+
+  const { jumpHopClient } = await import('./jumpHopClient');
+  const response = await jumpHopClient.getWorkDetail('profile-1');
+
+  expect(response.item.backButtonAsset).toEqual(backButtonAsset);
+});

src/services/jump-hop/jumpHopClient.ts

@@ -136,6 +136,8 @@ function normalizeJumpHopWorkProfile(
     characterAsset: flattened.characterAsset,
     tileAtlasAsset: flattened.tileAtlasAsset,
     tileAssets: flattened.tileAssets,
+    backButtonAsset:
+      flattened.backButtonAsset ?? flattened.draft?.backButtonAsset ?? null,
   };
 }