Old rule `li input[type="checkbox"] + *` absolutely-positioned the first
element sibling after the checkbox (typically <a>, <code>, <strong>),
yanking links and code spans out of flow and overlapping adjacent
content in the rendered PDF.
Replace with a targeted rule that styles the native disabled checkbox
inline (small green box) and leaves siblings untouched. Pandoc GFM emits
`<li><input disabled type="checkbox"> text…</li>` with no wrapper class,
so we target `li > input[type="checkbox"]` directly.
Co-Authored-By: Claude <noreply@anthropic.com>
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