Add copy actions to workshop code blocks

[Copilot]

Workshop docs code blocks did not provide a quick way to copy commands or snippets. This change adds inline copy actions to rendered markdown code blocks in the GitHub Pages step viewer.

• Code block enhancements

  • injects a copy button into each rendered pre > code block after markdown is parsed
  • copies the exact block contents, preserving multi-line snippets
  • avoids duplicate button injection when content is re-rendered

• Clipboard behavior

  • uses the async Clipboard API when available
  • falls back to the legacy copy path when clipboard access is unavailable or denied
  • surfaces transient UI states for success and failure

• UI + accessibility

  • styles the button to match the existing docs theme
  • reserves space within code blocks so the control does not overlap content
  • updates aria-label and announces state changes for assistive technologies

<pre><code>cd socops
./mvnw test</code></pre>

After render, the viewer augments the block with an inline Copy control and updates the label to Copied! or Failed based on the clipboard result.