Markdown preview pane now surfaces YAML front-matter above the TOC as a
key/value list (definition list), so engineering documents with header
metadata (title, revision, status, etc.) show their identity at a glance
without opening the file in mdedit. Front-matter parsing handles both
scalar and array values; arrays render as comma-joined.
TOC pane is now resizable (4px col-resize handle on its left edge);
preserves the user's chosen width across re-renders inside a single
session.
mdedit welcome banner moved inside #welcome-screen so the "browse opens
md in this same editor" callout only shows when no file is open — it
was previously visible in every state which was noisy.
archive.spec.js: wait for #filePreviewToggle to be attached before
clicking, fixing a Playwright flake where the preview button hadn't
mounted yet.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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