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/main/ipc/handlers/book.handler.ts

@@ -0,0 +1,39 @@
+import { ipcMain } from 'electron'
+import { IPC } from '../../../shared/ipc-channels'
+import type { BookMeta, CreateBookParams } from '../../../shared/types'
+import { BookRegistryService } from '../../services/book-registry'
+import { wrap } from '../result'
+
+export function registerBookHandlers(registry: BookRegistryService): void {
+  ipcMain.handle(IPC.BOOK_LIST, () => wrap(() => registry.list()))
+
+  ipcMain.handle(IPC.BOOK_CREATE, (_event, params: CreateBookParams) =>
+    wrap(() => registry.create(params))
+  )
+
+  ipcMain.handle(IPC.BOOK_DELETE, (_event, { bookId }: { bookId: string }) =>
+    wrap(() => {
+      registry.delete(bookId)
+    })
+  )
+
+  ipcMain.handle(IPC.BOOK_OPEN, (_event, { bookId }: { bookId: string }) =>
+    wrap(() => registry.open(bookId))
+  )
+
+  ipcMain.handle(
+    IPC.BOOK_UPDATE_META,
+    (
+      _event,
+      {
+        bookId,
+        ...patch
+      }: {
+        bookId: string
+        lastChapterId?: string | null
+        lastOpenedAt?: string
+        status?: BookMeta['status']
+      }
+    ) => wrap(() => registry.updateMeta(bookId, patch))
+  )
+}