chore: remove localStorage-based persistence

src/components/RestoreDraftDialog.vue

@@ -1,24 +0,0 @@
-<script setup lang="ts">
-defineProps<{
-  updatedAt: string
-}>()
-
-defineEmits<{
-  restore: []
-  discard: []
-}>()
-</script>
-
-<template>
-  <div class="dialog-overlay" role="dialog" aria-modal="true" aria-labelledby="restore-draft-title">
-    <div class="dialog">
-      <h2 id="restore-draft-title">发现未保存的草稿</h2>
-      <p>检测到本地保存的教案，最近更新时间：{{ updatedAt }}</p>
-      <p>是否恢复上次编辑的内容？</p>
-      <div class="dialog-actions">
-        <button type="button" @click="$emit('restore')">恢复</button>
-        <button type="button" @click="$emit('discard')">放弃</button>
-      </div>
-    </div>
-  </div>
-</template>

src/services/bookStorage.test.ts

@@ -1,26 +0,0 @@
-import { beforeEach, describe, expect, it } from 'vitest'
-import { createEmptyBook } from '../domain/teachingDesign'
-import { clearStoredBook, loadStoredBook, saveBook } from './bookStorage'
-
-describe('bookStorage', () => {
-  beforeEach(() => localStorage.clear())
-
-  it('round-trips a versioned book', () => {
-    const book = createEmptyBook()
-    book.cover.courseName = 'Web 前端开发'
-
-    expect(saveBook(book)).toEqual({ ok: true })
-    expect(loadStoredBook()?.cover.courseName).toBe('Web 前端开发')
-  })
-
-  it('returns null for malformed storage', () => {
-    localStorage.setItem('teaching-design-book', '{bad json')
-    expect(loadStoredBook()).toBeNull()
-  })
-
-  it('clears saved work', () => {
-    saveBook(createEmptyBook())
-    clearStoredBook()
-    expect(loadStoredBook()).toBeNull()
-  })
-})

src/services/bookStorage.ts

@@ -1,29 +0,0 @@
-import { BOOK_SCHEMA_VERSION, type TeachingBook } from '../domain/teachingDesign'
-
-const STORAGE_KEY = 'teaching-design-book'
-
-export type SaveResult = { ok: true } | { ok: false; message: string }
-
-export function saveBook(book: TeachingBook): SaveResult {
-  try {
-    localStorage.setItem(STORAGE_KEY, JSON.stringify(book))
-    return { ok: true }
-  } catch {
-    return { ok: false, message: '浏览器存储空间不足，当前修改尚未暂存。' }
-  }
-}
-
-export function loadStoredBook(): TeachingBook | null {
-  try {
-    const raw = localStorage.getItem(STORAGE_KEY)
-    if (!raw) return null
-    const parsed = JSON.parse(raw) as TeachingBook
-    return parsed.schemaVersion === BOOK_SCHEMA_VERSION ? parsed : null
-  } catch {
-    return null
-  }
-}
-
-export function clearStoredBook(): void {
-  localStorage.removeItem(STORAGE_KEY)
-}