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/chapter.handler.ts

@@ -0,0 +1,96 @@
+import { ipcMain } from 'electron'
+import { IPC } from '../../../shared/ipc-channels'
+import type { ChapterStatus } from '../../../shared/types'
+import { BookRegistryService } from '../../services/book-registry'
+import { wrap } from '../result'
+
+export function registerChapterHandlers(registry: BookRegistryService): void {
+  ipcMain.handle(
+    IPC.VOLUME_CREATE,
+    (_event, { bookId, name }: { bookId: string; name: string }) =>
+      wrap(() => {
+        const repo = registry.getVolumeRepo(bookId)
+        const volumes = repo.list()
+        return repo.create(name, volumes.length)
+      })
+  )
+
+  ipcMain.handle(
+    IPC.VOLUME_UPDATE,
+    (
+      _event,
+      { bookId, volumeId, name, description }: { bookId: string; volumeId: string; name?: string; description?: string }
+    ) => wrap(() => registry.getVolumeRepo(bookId).update(volumeId, { name, description }))
+  )
+
+  ipcMain.handle(
+    IPC.VOLUME_DELETE,
+    (_event, { bookId, volumeId }: { bookId: string; volumeId: string }) =>
+      wrap(() => {
+        registry.getVolumeRepo(bookId).delete(volumeId)
+      })
+  )
+
+  ipcMain.handle(
+    IPC.CHAPTER_CREATE,
+    (
+      _event,
+      { bookId, volumeId, title }: { bookId: string; volumeId: string; title: string }
+    ) =>
+      wrap(() => {
+        const repo = registry.getChapterRepo(bookId)
+        const sortOrder = repo.nextSortOrder(volumeId)
+        return repo.create(volumeId, title, sortOrder)
+      })
+  )
+
+  ipcMain.handle(
+    IPC.CHAPTER_GET,
+    (_event, { bookId, chapterId }: { bookId: string; chapterId: string }) =>
+      wrap(() => {
+        const ch = registry.getChapterRepo(bookId).get(chapterId)
+        if (!ch) throw new Error('Chapter not found')
+        return ch
+      })
+  )
+
+  ipcMain.handle(
+    IPC.CHAPTER_UPDATE,
+    (
+      _event,
+      {
+        bookId,
+        chapterId,
+        title,
+        content,
+        status,
+        cursorOffset
+      }: {
+        bookId: string
+        chapterId: string
+        title?: string
+        content?: string
+        status?: ChapterStatus
+        cursorOffset?: number
+      }
+    ) =>
+      wrap(() => {
+        const chapter = registry.getChapterRepo(bookId).update(chapterId, {
+          title,
+          content,
+          status,
+          cursorOffset
+        })
+        registry.updateMeta(bookId, { lastChapterId: chapterId })
+        return chapter
+      })
+  )
+
+  ipcMain.handle(
+    IPC.CHAPTER_DELETE,
+    (_event, { bookId, chapterId }: { bookId: string; chapterId: string }) =>
+      wrap(() => {
+        registry.getChapterRepo(bookId).delete(chapterId)
+      })
+  )
+}