useSidebar is not exported

[yanwuguangjun]

Describe the bug

I usually use api useSidebar at new version

Reproduction

`

vitepress build

vitepress v2.0.0-alpha.7

✗ Build failed in 5.59s
✗ building client + server bundles...
build error:
map.md?vue&type=script&setup=true&lang.ts (6:9): "useSidebar" is not exported by "

`

Expected behavior

working

System Info

System:
    OS: Windows 11 10.0.22000
    CPU: (8) x64 Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz
    Memory: 12.20 GB / 31.87 GB
  Binaries:
    Node: 22.15.0 - D:\Program Files\nodejs\node.EXE
    Memory: 12.20 GB / 31.87 GB
    Memory: 12.20 GB / 31.87 GB
    Memory: 12.20 GB / 31.87 GB
  Binaries:
    Node: 22.15.0 - D:\Program Files\nodejs\node.EXE
    npm: 10.9.2 - D:\Program Files\nodejs\npm.CMD
    pnpm: 10.10.0 - ~\AppData\Roaming\npm\pnpm.CMD
  Browsers:
    Edge: Spartan (44.22000.120.0), Chromium (135.0.3179.98)
    Internet Explorer: 11.0.22000.120
  npmPackages:
    vitepress: ^2.0.0-alpha.7 => 2.0.0-alpha.7

Additional context

No response

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