feat: 实现笔临 P0/P1 Electron 桌面应用 v0.1.0

交付写作核心（TipTap、自动保存、分卷分章）、Onboarding、7 主题与双语 i18n、快捷键设置；主进程使用 node:sqlite；补全 Vitest 与 Playwright E2E；统一 design/ 目录并移除 desigin 拼写错误路径。

Co-authored-by: Cursor <cursoragent@cursor.com>

src/shared/electron-api.d.ts

@@ -0,0 +1,61 @@
+import type {
+  ActionId,
+  BookMeta,
+  BookOpenResult,
+  Chapter,
+  CreateBookParams,
+  GlobalSettings,
+  IpcResult,
+  UpdateChapterParams,
+  Volume
+} from './types'
+
+export interface ElectronAPI {
+  window: {
+    minimize: () => Promise<void>
+    maximize: () => Promise<void>
+    close: () => Promise<void>
+  }
+  settings: {
+    get: () => Promise<IpcResult<GlobalSettings>>
+    update: (partial: Partial<GlobalSettings>) => Promise<IpcResult<GlobalSettings>>
+  }
+  book: {
+    list: () => Promise<IpcResult<BookMeta[]>>
+    create: (params: CreateBookParams) => Promise<IpcResult<BookMeta>>
+    delete: (bookId: string) => Promise<IpcResult<void>>
+    open: (bookId: string) => Promise<IpcResult<BookOpenResult>>
+    updateMeta: (
+      bookId: string,
+      patch: { lastChapterId?: string | null; status?: BookMeta['status'] }
+    ) => Promise<IpcResult<BookMeta>>
+  }
+  volume: {
+    create: (bookId: string, name: string) => Promise<IpcResult<Volume>>
+    update: (
+      bookId: string,
+      volumeId: string,
+      patch: { name?: string; description?: string }
+    ) => Promise<IpcResult<Volume>>
+    delete: (bookId: string, volumeId: string) => Promise<IpcResult<void>>
+  }
+  chapter: {
+    create: (bookId: string, volumeId: string, title: string) => Promise<IpcResult<Chapter>>
+    get: (bookId: string, chapterId: string) => Promise<IpcResult<Chapter>>
+    update: (params: UpdateChapterParams) => Promise<IpcResult<Chapter>>
+    delete: (bookId: string, chapterId: string) => Promise<IpcResult<void>>
+  }
+  shortcut: {
+    getAll: () => Promise<IpcResult<Record<ActionId, string>>>
+    register: (action: ActionId, accelerator: string) => Promise<IpcResult<void>>
+  }
+  onShortcutTriggered: (callback: (action: ActionId) => void) => () => void
+}
+
+declare global {
+  interface Window {
+    electronAPI: ElectronAPI
+  }
+}
+
+export {}