- Model: `SectionProps::doc_grid` (`w:docGrid` type, line pitch, charSpace) and the
paragraph `w:snapToGrid` flag; DOCX read and write (ECMA-376 §17.6.5).
- Layout: with a line grid, lines of snapping paragraphs take whole line pitches with
their text centred; with a character grid, East Asian characters take whole cells of
the character pitch (all text with snapToChars), Latin text stays proportional.
Hostile pitches and charSpace are clamped. Headers and footers don't snap.
- Command `layout.documentGrid` (type, linesPerPage, charsPerLine, linePitch,
charSpace), one undo step, section scope; catalog row under Layout › Page Setup.
- Page Setup dialog: Document Grid section; View › Gridlines draws the document
grid of a section that has one. UI strings in every catalog (incl. et, sr, sr-latn).
- Tests: DOCX round trip, line pitch and lines per page, character pitch placement,
command with clamping and undo.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
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