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/ipc-channels.ts

@@ -0,0 +1,22 @@
+export const IPC = {
+  SETTINGS_GET: 'settings:get',
+  SETTINGS_UPDATE: 'settings:update',
+  BOOK_LIST: 'book:list',
+  BOOK_CREATE: 'book:create',
+  BOOK_DELETE: 'book:delete',
+  BOOK_OPEN: 'book:open',
+  BOOK_UPDATE_META: 'book:updateMeta',
+  VOLUME_CREATE: 'volume:create',
+  VOLUME_UPDATE: 'volume:update',
+  VOLUME_DELETE: 'volume:delete',
+  CHAPTER_CREATE: 'chapter:create',
+  CHAPTER_GET: 'chapter:get',
+  CHAPTER_UPDATE: 'chapter:update',
+  CHAPTER_DELETE: 'chapter:delete',
+  SHORTCUT_GET_ALL: 'shortcut:getAll',
+  SHORTCUT_REGISTER: 'shortcut:register',
+  SHORTCUT_TRIGGERED: 'shortcut:triggered',
+  WINDOW_MINIMIZE: 'window:minimize',
+  WINDOW_MAXIMIZE: 'window:maximize',
+  WINDOW_CLOSE: 'window:close'
+} as const