- Preset fields (from settings) are now seeded as editable/deletable rows in
the modal alongside custom ones, using one consistent row style.
- The note's own merged frontmatter is shown as read-only (disabled) rows at
the top of the list (only when 'Merge document frontmatter' is on, and only
for keys not overridden by an editable row).
- Drops the separate read-only 'resolved' text preview; the rows are the
WYSIWYG result.
Adds pure, unit-tested composeFrontmatter()/docFrontmatterToPairs() and removes
the superseded resolveFrontmatter(). Editable rows are authoritative: on a key
collision they override the merged document field. Presets are deep-copied so
editing rows never mutates saved settings.
Co-Authored-By: Claude
