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/renderer/stores/useTabStore.ts

@@ -0,0 +1,58 @@
+import { create } from 'zustand'
+
+export interface AppTab {
+  id: string
+  type: 'book' | 'settings'
+  name: string
+  bookId?: string
+}
+
+interface TabState {
+  openTabs: AppTab[]
+  activeTabId: string | null
+  openBookTab: (bookId: string, name: string) => void
+  openSettingsTab: () => void
+  switchTab: (tabId: string) => void
+  closeTab: (tabId: string) => string | null
+}
+
+export const useTabStore = create<TabState>((set, get) => ({
+  openTabs: [],
+  activeTabId: null,
+  openBookTab: (bookId, name) => {
+    const existing = get().openTabs.find((t) => t.type === 'book' && t.bookId === bookId)
+    if (existing) {
+      set({ activeTabId: existing.id })
+      return
+    }
+    const id = `book-${bookId}`
+    set((s) => ({
+      openTabs: [...s.openTabs, { id, type: 'book', name, bookId }],
+      activeTabId: id
+    }))
+  },
+  openSettingsTab: () => {
+    const existing = get().openTabs.find((t) => t.type === 'settings')
+    if (existing) {
+      set({ activeTabId: existing.id })
+      return
+    }
+    set((s) => ({
+      openTabs: [...s.openTabs, { id: 'settings', type: 'settings', name: '系统设置' }],
+      activeTabId: 'settings'
+    }))
+  },
+  switchTab: (tabId) => set({ activeTabId: tabId }),
+  closeTab: (tabId) => {
+    const { openTabs, activeTabId } = get()
+    const idx = openTabs.findIndex((t) => t.id === tabId)
+    if (idx === -1) return activeTabId
+    const nextTabs = openTabs.filter((t) => t.id !== tabId)
+    let nextActive = activeTabId
+    if (activeTabId === tabId) {
+      nextActive = nextTabs[Math.max(0, idx - 1)]?.id ?? null
+    }
+    set({ openTabs: nextTabs, activeTabId: nextActive })
+    return nextActive
+  }
+}))