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/services/global-settings.ts

@@ -0,0 +1,50 @@
+import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'fs'
+import { join } from 'path'
+import { DEFAULT_SHORTCUTS } from '../../shared/default-shortcuts'
+import type { GlobalSettings } from '../../shared/types'
+
+const FILE = 'global_settings.json'
+
+function defaults(): GlobalSettings {
+  return {
+    penName: '未命名作者',
+    onboardingCompleted: false,
+    theme: 'default',
+    language: 'zh-CN',
+    dailyWordGoal: 0,
+    shortcuts: { ...DEFAULT_SHORTCUTS }
+  }
+}
+
+export class GlobalSettingsService {
+  constructor(private userDataDir: string) {
+    if (!existsSync(userDataDir)) mkdirSync(userDataDir, { recursive: true })
+  }
+
+  private filePath(): string {
+    return join(this.userDataDir, FILE)
+  }
+
+  get(): GlobalSettings {
+    if (!existsSync(this.filePath())) return defaults()
+    const raw = JSON.parse(readFileSync(this.filePath(), 'utf-8')) as Partial<GlobalSettings>
+    return {
+      ...defaults(),
+      ...raw,
+      shortcuts: { ...DEFAULT_SHORTCUTS, ...raw.shortcuts }
+    }
+  }
+
+  update(partial: Partial<GlobalSettings>): GlobalSettings {
+    const current = this.get()
+    const next: GlobalSettings = {
+      ...current,
+      ...partial,
+      shortcuts: partial.shortcuts
+        ? { ...current.shortcuts, ...partial.shortcuts }
+        : current.shortcuts
+    }
+    writeFileSync(this.filePath(), JSON.stringify(next, null, 2), 'utf-8')
+    return next
+  }
+}