feat(files): 文件管理四项——侧栏拖拽移动、草稿跨窗口认领、未命名默认存根目录、打开所在位置（docs/25）

tests/window-claims.test.ts

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+// 跨窗口草稿认领：别的窗口打开着的文档不该在本窗口再弹恢复提示；
+// 窗口注销或认领过期后，草稿重新可被提示（真正的崩溃恢复不被吞）。
+import { describe, it, expect, beforeEach } from 'vitest'
+import { createWindowClaims, CLAIM_STALE_MS } from '../src/services/windowClaims'
+
+describe('跨窗口文档认领', () => {
+  beforeEach(() => { localStorage.clear() })
+
+  it('其他窗口认领的文档键会被列出，本窗口自己的不算', () => {
+    const a = createWindowClaims('win-a')
+    const b = createWindowClaims('win-b')
+    a.update(['path:C:/docs/a.md'])
+    b.update(['path:C:/docs/b.md'])
+    expect([...b.liveClaimedKeys()]).toEqual(['path:C:/docs/a.md'])
+    expect([...a.liveClaimedKeys()]).toEqual(['path:C:/docs/b.md'])
+  })
+
+  it('窗口注销后其认领立即失效', () => {
+    const a = createWindowClaims('win-a')
+    const b = createWindowClaims('win-b')
+    a.update(['path:C:/docs/a.md'])
+    a.dispose()
+    expect(b.liveClaimedKeys().size).toBe(0)
+  })
+
+  it('认领过期（窗口崩溃未注销）后自动失效，不吞崩溃草稿', () => {
+    let t = 1_000_000
+    const now = () => t
+    const a = createWindowClaims('win-a', localStorage, now)
+    const b = createWindowClaims('win-b', localStorage, now)
+    a.update(['path:C:/docs/a.md'])
+    expect(b.liveClaimedKeys().size).toBe(1)
+    t += CLAIM_STALE_MS + 1
+    expect(b.liveClaimedKeys().size).toBe(0)
+  })
+})