fix: 完善学习进度同步与拼图收集流程

统一阶段拼图配置和进度上报，增加同步写入协调与失败重试，优化收集确认及同步反馈，并展示菜单探索进度。补充相关回归测试与字体素材。

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/store/localArtwork.test.ts

@@ -0,0 +1,68 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+
+const { setUserDefine } = vi.hoisted(() => ({
+  setUserDefine: vi.fn().mockResolvedValue({ success: true }),
+}))
+vi.mock('@/lib/utils/api-common', () => ({ setUserDefine }))
+
+beforeEach(() => {
+  vi.resetModules()
+  setUserDefine.mockClear()
+  const storage = new Map<string, string>()
+  vi.stubGlobal('localStorage', {
+    getItem: (key: string) => storage.get(key) ?? null,
+    setItem: (key: string, value: string) => storage.set(key, value),
+    removeItem: (key: string) => storage.delete(key),
+  })
+  vi.stubGlobal('window', { localStorage })
+})
+
+afterEach(() => vi.unstubAllGlobals())
+
+const image = 'data:image/jpeg;base64,YWJj'
+
+describe('local-only artwork', () => {
+  it('keeps Zhang Leping artwork locally and excludes even short data URLs from sync', async () => {
+    const { useZhanglepingStore, saveZhanglepingStore, applyZhanglepingPersistedState } =
+      await import('./zhanglepingStore')
+    useZhanglepingStore.getState().setDrawArtwork(image, 'caption')
+    await saveZhanglepingStore()
+    const payload = JSON.parse(setUserDefine.mock.calls[0]![2])
+    expect(payload).not.toHaveProperty('drawArtworkDataUrl')
+    expect(payload.drawArtworkCaption).toBe('caption')
+    expect(payload.hasDrawArtwork).toBe(true)
+    applyZhanglepingPersistedState(payload)
+    expect(useZhanglepingStore.getState().drawArtworkDataUrl).toBe(image)
+    expect(JSON.parse(localStorage.getItem('zhangleping-storage')!).state.drawArtworkDataUrl).toBe(
+      image
+    )
+  })
+
+  it('keeps Nie Er previews locally while syncing other work fields', async () => {
+    const { useNieerStore, saveNieerStore, applyNieerPersistedState } = await import('./nieerStore')
+    useNieerStore.getState().setReflectionWork(6, { previewImageDataUrl: image, paradeId: '1' })
+    await saveNieerStore()
+    const payload = JSON.parse(setUserDefine.mock.calls[0]![2])
+    expect(payload.reflectionWorks[6]).not.toHaveProperty('previewImageDataUrl')
+    expect(payload.reflectionWorks[6].paradeId).toBe('1')
+    expect(useNieerStore.getState().reflectionWorks[6]?.previewImageDataUrl).toBe(image)
+    applyNieerPersistedState(payload)
+    expect(useNieerStore.getState().reflectionWorks[6]?.previewImageDataUrl).toBe(image)
+    expect(
+      JSON.parse(localStorage.getItem('nieer-storage')!).state.reflectionWorks[6]
+        .previewImageDataUrl
+    ).toBe(image)
+  })
+
+  it('does not restore legacy remote images over local images', async () => {
+    const { useZhanglepingStore, applyZhanglepingPersistedState } =
+      await import('./zhanglepingStore')
+    const { useNieerStore, applyNieerPersistedState } = await import('./nieerStore')
+    useZhanglepingStore.getState().setDrawArtwork(image, 'caption')
+    useNieerStore.getState().setReflectionWork(6, { previewImageDataUrl: image })
+    applyZhanglepingPersistedState({ drawArtworkDataUrl: 'remote' })
+    applyNieerPersistedState({ reflectionWorks: { 6: { previewImageDataUrl: 'remote' } } })
+    expect(useZhanglepingStore.getState().drawArtworkDataUrl).toBe(image)
+    expect(useNieerStore.getState().reflectionWorks[6]?.previewImageDataUrl).toBe(image)
+  })
+})