适配讲解详情聚合接口

tests/unit/ExhibitDetailAudioFirst.spec.ts

@@ -9,6 +9,7 @@ const mocks = vi.hoisted(() => ({
   onHideHandler: null as null | (() => void),
   onUnloadHandler: null as null | (() => void),
   enterExplainDetail: vi.fn(),
+  selectExplainDetailLanguage: vi.fn(),
   loadExplainDetailText: vi.fn(),
   selectAudioForExplainDetail: vi.fn(),
   play: vi.fn(),
@@ -43,6 +44,7 @@ vi.mock('@dcloudio/uni-app', () => ({
 vi.mock('@/usecases/explainUseCase', () => ({
   explainUseCase: {
     enterExplainDetail: mocks.enterExplainDetail,
+    selectExplainDetailLanguage: mocks.selectExplainDetailLanguage,
     loadExplainDetailText: mocks.loadExplainDetailText,
     selectAudioForExplainDetail: mocks.selectAudioForExplainDetail
   }
@@ -110,6 +112,10 @@ describe('讲解详情音频优先布局', () => {
     audioState.currentTime.value = 0
     audioState.duration.value = 0
     mocks.enterExplainDetail.mockResolvedValue(exhibit)
+    mocks.selectExplainDetailLanguage.mockImplementation((source, lang) => ({
+      ...source,
+      audioLanguage: lang
+    }))
     mocks.loadExplainDetailText.mockResolvedValue({ available: false })
     mocks.selectAudioForExplainDetail.mockResolvedValue({
       playable: true,
@@ -191,7 +197,7 @@ describe('讲解详情音频优先布局', () => {
     expect(wrapper.find('.detail-language-bar').exists()).toBe(false)
   })
 
-  it('深链语言不受支持时回退至中文并规范化地址', async () => {
+  it('深链语言不受支持时本地回退至中文并规范化地址', async () => {
     mocks.enterExplainDetail.mockImplementation(async (request: { lang: string }) => ({
       ...exhibit,
       audioLanguage: request.lang,
@@ -205,8 +211,9 @@ describe('讲解详情音频优先布局', () => {
     await mocks.onLoadHandler?.({ id: exhibit.id, lang: 'en-US', targetType: 'STOP', targetId: 'stop-1' })
     await flushPromises()
 
-    expect(mocks.enterExplainDetail).toHaveBeenNthCalledWith(1, expect.objectContaining({ lang: 'en-US' }))
-    expect(mocks.enterExplainDetail).toHaveBeenNthCalledWith(2, expect.objectContaining({ lang: 'zh-CN' }))
+    expect(mocks.enterExplainDetail).toHaveBeenCalledTimes(1)
+    expect(mocks.enterExplainDetail).toHaveBeenCalledWith(expect.objectContaining({ lang: 'en-US' }))
+    expect(mocks.selectExplainDetailLanguage).toHaveBeenCalledWith(expect.any(Object), 'zh-CN')
     expect(wrapper.get('.language-option').classes()).toContain('active')
     expect(wrapper.get('.language-option-text').text()).toBe('中文')
     expect(replaceState).toHaveBeenCalledWith(null, '', expect.stringContaining('lang=zh-CN'))
@@ -244,6 +251,34 @@ describe('讲解详情音频优先布局', () => {
     expect(wrapper.get('.detail-audio-play').attributes('disabled')).toBeDefined()
   })
 
+  it('切换语言时使用初次详情响应中的变体，不重复请求详情或正文', async () => {
+    const localizedExhibit = {
+      ...exhibit,
+      guideText: '粤语通道使用普通话文案。',
+      audioUrl: '/assets/astrolabe-yue.mp3',
+      audioDuration: 83,
+      audioLanguage: 'yue-HK',
+      audioStatus: 'READY',
+      audioHasText: true,
+      supportedLanguages: ['zh-CN', 'yue-HK', 'en-US']
+    }
+    mocks.selectExplainDetailLanguage.mockReturnValue(localizedExhibit)
+    const wrapper = mount(ExhibitDetail, {
+      global: { stubs: { GuidePageFrame: GuidePageFrameStub } }
+    })
+
+    await mocks.onLoadHandler?.({ id: exhibit.id, lang: 'en-US', targetType: 'STOP', targetId: 'stop-1' })
+    await flushPromises()
+    await wrapper.findAll('.language-option').find((node) => node.text() === '粤语')?.trigger('tap')
+    await flushPromises()
+
+    expect(mocks.enterExplainDetail).toHaveBeenCalledTimes(1)
+    expect(mocks.loadExplainDetailText).not.toHaveBeenCalled()
+    expect(mocks.selectExplainDetailLanguage).toHaveBeenCalledWith(expect.any(Object), 'yue-HK')
+    expect(wrapper.get('.section-text').text()).toContain('粤语通道使用普通话文案')
+    expect(wrapper.get('.detail-audio-subtitle').text()).toContain('粤语')
+  })
+
   it('无音频时禁用播放按钮并显示原因', async () => {
     mocks.enterExplainDetail.mockResolvedValue({
       ...exhibit,