Copy button on v2 docs install block copies the `$` prompt prefix

On https://opencode.ai/v2/docs, clicking Copy on the Install block also copies the leading $ on every line, so pasting into a shell fails.

What I get:

$ npm install -g @opencode-ai/cli@beta
$ bun install -g --trust @opencode-ai/cli@beta
...

The $ is not styling, it is real text. It is in the button's data-code, and the click handler writes that straight to the clipboard with no stripping:

await navigator.clipboard.writeText(t.dataset.code ?? "")

It comes from the page source. curl -H 'Accept: text/markdown' https://opencode.ai/v2/docs shows the $ hardcoded in the code prop:

<CodeBlock
  code={`$ npm install -g @opencode-ai/cli@beta
$ bun install -g --trust @opencode-ai/cli@beta`}
/>

Two options:

1. Strip a leading $ per line when building the clipboard string in CodeBlock. Keeps the look, fixes every block including future ones.
2. Drop $ from the content and render it with CSS ::before. Correct by design, but touches every code block.

Option 1 seems like the smaller diff, and close to what Starlight and Mintlify do.

Repro: open the page, click Copy on the Install block, paste into a terminal. Seen on Chrome and Safari on macOS.

Happy to send a patch, but I could not find the v2 docs source in a public branch (packages/web on dev is the v1 Starlight site). Point me at the right repo or branch and I will open a PR.