fix: in accessibility-tree some link has no name

[skyeryg]

surf tab.new https://opencode.ai/docs
surf read

before output:

link "跳转到内容" [e1] [cursor=pointer] href="#_top"
link [e2] [cursor=pointer] href="/docs/zh-cn"
link [e3] [cursor=pointer] href="https://github.com/anomalyco/opencode"
link [e4] [cursor=pointer] href="https://opencode.ai/discord"
button "搜索" [e5] [cursor=pointer]
link [e6] [cursor=pointer] href="/docs/zh-cn/"
link [e7] [cursor=pointer] href="/docs/zh-cn/config/"
link [e8] [active] [cursor=pointer] href="/docs/zh-cn/providers/"
link [e9] [cursor=pointer] href="/docs/zh-cn/network/"
link [e10] [cursor=pointer] href="/docs/zh-cn/enterprise/"
link [e11] [cursor=pointer] href="/docs/zh-cn/troubleshooting/"
link [e12] [cursor=pointer] href="/docs/zh-cn/windows-wsl"

after output:

link "跳转到内容" [e1] [cursor=pointer] href="#_top"
link "OpenCode" [e2] [cursor=pointer] href="/docs/zh-cn"
link [e3] [cursor=pointer] href="https://github.com/anomalyco/opencode"
link [e4] [cursor=pointer] href="https://opencode.ai/discord"
button "搜索" [e5] [cursor=pointer]
link "简介" [e6] [cursor=pointer] href="/docs/zh-cn/"
link "配置" [e7] [cursor=pointer] href="/docs/zh-cn/config/"
link "提供商" [e8] [active] [cursor=pointer] href="/docs/zh-cn/providers/"
link "网络" [e9] [cursor=pointer] href="/docs/zh-cn/network/"
link "企业版" [e10] [cursor=pointer] href="/docs/zh-cn/enterprise/"
link "故障排除" [e11] [cursor=pointer] href="/docs/zh-cn/troubleshooting/"
link "Windows" [e12] [cursor=pointer] href="/docs/zh-cn/windows-wsl"