Draw tab: draw with pen, pencil and highlighter, erase ink, and hide ink (#315)

* Draw Table and Eraser: draw tables and split or merge cells with a pen (#303)

Insert › Tables › Draw Table and Table Layout › Draw › Draw Table / Eraser.
table.draw takes a pen stroke in page points: a rectangle outside a table
inserts a one-cell table of that size at the paragraph under its start; a
straight vertical or horizontal line inside a table splits the cells it
crosses (new grid column or row; untouched cells span it). table.eraser
merges the two cells beside the border nearest a point. Each stroke is one
undo step. In the app the buttons toggle pen and eraser modes with a live
preview, a crosshair with the tool's icon, and Esc to stop; canvas clicks
don't move the caret while a tool is on. Splitting through part of a
vertically merged cell and erasing beside one are refused with a clear
error. Catalog 384/430 -> 387/430.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Draw tab: pen, pencil and highlighter ink, stroke eraser and Hide Ink (#307)

Ink strokes are floating freeform shapes: a new Freeform geometry (paths in
shape-local coordinates, opacity, and the pen that drew it) on
InlineObject::Shape with ShapeKind::Freeform. draw.stroke inserts one
anchored to the paragraph under the first point (one undo step; points
capped per stroke, strokes capped per page, NaN dropped); draw.erase /
draw.eraser with a point deletes the stroke under it; draw.pen, draw.pencil,
draw.highlighter, draw.eraser and draw.select set the Draw tab's tool in the
session view state; review.hideInk toggles showing ink on screen.

The canvas draws a live stroke while a pen is dragged and commits it on
release; the eraser deletes strokes it passes over (one undo step per drag);
Esc or Select goes back to selecting. Draw tab buttons show the tool in use,
with colour and thickness menus; Review gets an Ink group with Hide Ink.
Ink renders with round caps and joins on screen and in PDF; highlighters are
translucent and behind the text. DOCX writes freeforms as wps:wsp with
a:custGeom (moveTo/lnTo) in a wp:anchor and reads them back, along with
simple custom-geometry freeforms from other files.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* #315 review fixes: eraser undo test, sanitized tap dots, custGeom path cap, ink docs

- draw.eraser with a point erases through draw.erase: test that it is one
  undo step (undo/redo) and marks the document dirty.
- Render and PDF: a single-point stroke's dot is drawn at the sanitized
  point, not the raw first one.
- DOCX custGeom reading stops once MAX_PATHS paths (subpaths included) are
  collected, across a:path elements.
- docs/file-format-parity.md: ink is saved as custom geometry, not InkML, so
  Word shows it as a freeform.
- widgets test: theme::apply takes an Appearance (#317).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* fmt

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Draw tab: pen, pencil and highlighter ink, stroke eraser and Hide Ink (#307)

Ink strokes are floating freeform shapes: a new Freeform geometry (paths in
shape-local coordinates, opacity, and the pen that drew it) on
InlineObject::Shape with ShapeKind::Freeform. draw.stroke inserts one
anchored to the paragraph under the first point (one undo step; points
capped per stroke, strokes capped per page, NaN dropped); draw.erase /
draw.eraser with a point deletes the stroke under it; draw.pen, draw.pencil,
draw.highlighter, draw.eraser and draw.select set the Draw tab's tool in the
session view state; review.hideInk toggles showing ink on screen.

The canvas draws a live stroke while a pen is dragged and commits it on
release; the eraser deletes strokes it passes over (one undo step per drag);
Esc or Select goes back to selecting. Draw tab buttons show the tool in use,
with colour and thickness menus; Review gets an Ink group with Hide Ink.
Ink renders with round caps and joins on screen and in PDF; highlighters are
translucent and behind the text. DOCX writes freeforms as wps:wsp with
a:custGeom (moveTo/lnTo) in a wp:anchor and reads them back, along with
simple custom-geometry freeforms from other files.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>

docs/parity-checklist.md

@@ -2,7 +2,7 @@
 
 Generated by `cargo xtask parity` (`wordcraft-cli parity --markdown`): the word-processor feature catalog (`crates/engine/src/catalog.rs`) compared with the live command registry.
 
-**396 of 434 catalog features have commands (91.2%).**
+**402 of 434 catalog features have commands (92.6%).**
 
 | Tab | Live | Total |
 |---|---|---|
@@ -10,12 +10,12 @@ Generated by `cargo xtask parity` (`wordcraft-cli parity --markdown`): the word-
 | Quick Access | 4 | 4 |
 | Home | 99 | 102 |
 | Insert | 43 | 53 |
-| Draw | 0 | 11 |
+| Draw | 5 | 11 |
 | Design | 10 | 10 |
 | Layout | 19 | 19 |
 | References | 24 | 24 |
 | Mailings | 17 | 17 |
-| Review | 27 | 30 |
+| Review | 28 | 30 |
 | View | 25 | 29 |
 | Table Design | 8 | 8 |
 | Table Layout | 30 | 30 |
@@ -49,12 +49,7 @@ Generated by `cargo xtask parity` (`wordcraft-cli parity --markdown`): the word-
 
 ### Draw
 
-- Tools › Select (`draw.select`)
 - Tools › Lasso Select (`draw.lasso`)
-- Tools › Eraser (`draw.eraser`)
-- Pens › Pen (`draw.pen`)
-- Pens › Pencil (`draw.pencil`)
-- Pens › Highlighter (`draw.highlighter`)
 - Pens › Add Pen (`draw.addPen`)
 - Convert › Ink to Shape (`draw.inkToShape`)
 - Convert › Ink to Math (`draw.inkToMath`)
@@ -65,7 +60,6 @@ Generated by `cargo xtask parity` (`wordcraft-cli parity --markdown`): the word-
 
 - Language › Translate (`review.translate`)
 - Protect › Block Authors (`review.blockAuthors`)
-- Ink › Hide Ink (`review.hideInk`)
 
 ### View