Static markup-only component for the dark code/markdown preview surface.
Renders the preview header (title + actions), the file-tabs slot, and
either the source body or the rendered Markdown body based on the
'rendered' prop. Toggling between modes is task 16.
Preserves every CSS hook asserted by scripts/verify.mjs:
.preview, .preview-title, .preview-markdown, .markdown-preview,
max-height:540px, .markdown-table-wrap, .markdown-frontmatter,
.markdown-toc, plus the dark surface treatment. Visual fidelity gaps
listed in the task report.
Did not: introduce a markdown renderer (task 16 hydrates the body);
port the cat-marker CSS hook to the new surface (legacy only).
Marcos Paulo
914a813b8f