feat: 阶段1-3 桌面编辑器（Tauri 骨架/编辑核心深化/复杂内容）

tests/tabs.test.ts

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+import { describe, it, expect } from 'vitest'
+import { tabsReducer, createTab, isDirty, type TabsState } from '../src/stores/tabs'
+
+function stateWith(contents: string[]): TabsState {
+  const tabs = contents.map((c, i) => createTab({ title: `文档${i + 1}`, content: c }))
+  return { tabs, activeId: tabs[0]?.id ?? null }
+}
+
+describe('标签页会话模型', () => {
+  it('同路径文档重复打开只激活已有标签', () => {
+    const a = createTab({ title: 'a.md', path: '/x/a.md', content: 'A' })
+    let s: TabsState = { tabs: [a], activeId: a.id }
+    s = tabsReducer(s, { type: 'open', tab: createTab({ title: 'a.md', path: '/x/a.md', content: 'A2' }) })
+    expect(s.tabs).toHaveLength(1)
+    expect(s.activeId).toBe(a.id)
+  })
+
+  it('dirty 由 content 与 savedContent 比较得出，保存后清除，改回原样也清除', () => {
+    const t = createTab({ content: '原文' })
+    expect(isDirty(t)).toBe(false)
+    let s: TabsState = { tabs: [t], activeId: t.id }
+    s = tabsReducer(s, { type: 'updateContent', id: t.id, content: '原文改' })
+    expect(isDirty(s.tabs[0])).toBe(true)
+    s = tabsReducer(s, { type: 'updateContent', id: t.id, content: '原文' })
+    expect(isDirty(s.tabs[0])).toBe(false)
+    s = tabsReducer(s, { type: 'updateContent', id: t.id, content: '新版' })
+    s = tabsReducer(s, { type: 'saved', id: t.id })
+    expect(isDirty(s.tabs[0])).toBe(false)
+    expect(s.tabs[0].savedContent).toBe('新版')
+  })
+
+  it('关闭活动标签后激活相邻标签；关闭其他/右侧范围正确', () => {
+    let s = stateWith(['a', 'b', 'c'])
+    const [t1, t2, t3] = s.tabs
+    s = tabsReducer(s, { type: 'activate', id: t2.id })
+    s = tabsReducer(s, { type: 'close', id: t2.id })
+    expect(s.tabs.map((t) => t.id)).toEqual([t1.id, t3.id])
+    expect(s.activeId).toBe(t3.id)
+    s = tabsReducer(s, { type: 'open', tab: createTab({ title: 'd', content: 'd' }) })
+    const t4 = s.tabs[2]
+    s = tabsReducer(s, { type: 'closeRight', id: t1.id })
+    expect(s.tabs.map((t) => t.id)).toEqual([t1.id])
+    void t4
+  })
+
+  it('拖拽排序 move 到目标下标', () => {
+    let s = stateWith(['a', 'b', 'c'])
+    const [t1, , t3] = s.tabs
+    s = tabsReducer(s, { type: 'move', id: t1.id, toIndex: 2 })
+    expect(s.tabs[2].id).toBe(t1.id)
+    expect(s.tabs[0].id).toBe(t3.id === s.tabs[0].id ? t3.id : s.tabs[0].id)
+  })
+})