Add copy button to code blocks - #54
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Add a copy button to each code block that appears on hover at the top-right corner. Clicking copies the code to the clipboard and briefly shows "Copied!". Styled for all themes (GitHub, Simple, Dark) and hidden during printing. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Strip trailing newlines from code block text before writing to clipboard, as chroma appends a trailing newline to rendered code blocks. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
chroma applies display:flex to span.line, causing innerText to insert extra newlines between each line. Switch to textContent which reads raw text node values without CSS layout side-effects. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
<pre><code>block, displayed at the top-right corner on hoverImplementation
New file
internal/template/copybutton.gofollowing the same pattern astoc.go/lineanchor.go:copyButtonCSS: positions the button absolutely in the top-right ofpre, with hover/focus reveal and per-theme colorscopyButtonJS: injects buttons onDOMContentLoaded; usestextContent(notinnerText) to avoid extra newlines introduced by chroma'sdisplay: flexonspan.lineTest plan
Closes #53
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