Part of #394: Preferences for snapping, handles, rubber bands, pattern tiles, tints and type

Fourteen more Preferences options that were stored but read by nothing now
act, for the mouse and for agents (prefs.set, then pointer_gesture,
press_key or the commands):

- Selection & Anchor Display: Snap to Point and its distance (with Smart
  Guides off, View > Snap to Point lands a dragged selection's grabbed
  point, drawn points and reference points on anchors and ruler guides);
  Move Locked and Hidden Artwork with Artboard (artboard.move, the Artboard
  tool and Rearrange; off, hidden art now stays too); Enable Rubber Band for
  the Pen and Curvature tools; Handles (solid, hollow, large);
  Show handles when multiple anchors are selected (canvas and Direct
  Selection's handle picking); Hide Corner Widget for angles greater than.
- General: Transform Pattern Tiles is the default of a new `patterns`
  param on object.transform/move/rotate/scale/reflect/shear/transformEach
  (journalled when the art uses a pattern), and the transform dialogs get a
  Transform Patterns checkbox; Select Same Tint % (off, Select > Same
  Fill/Stroke Color takes every tint of a global or spot swatch).
- Type: new type.step {attribute, by} steps size, leading, tracking, kerning
  and baseline shift by the Size/Leading, Tracking and Baseline Shift
  increments; Increase/Decrease Font Size (Cmd+Shift+. and Cmd+Shift+,);
  the Type tool's Alt+arrows (kerning at a caret or tracking, leading,
  Shift for baseline shift, Cmd/Ctrl for five steps). Enable Missing Glyph
  Protection keeps characters a new font lacks in the font that had them
  (text.setStyle, text.setRangeStyle). Fill New Type Objects With
  Placeholder Text: type the Type tools place starts with placeholder text,
  selected (text.create / text.createInPath take `placeholder`).

Units > General, Stroke and Type were already the single source of truth
(units.rs). Auto Size New Area Type, Show Font Names in English and
Highlight Alternate Glyphs need subsystems the app doesn't have yet and
stay open with the rest of #394.

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

docs/mcp.md

@@ -1117,6 +1117,22 @@ The Selection & Anchor Display and General preferences apply to `pointer_gesture
   topmost again. Cmd held to borrow the selection tool from another tool clicks as usual.
 - `doubleClickToIsolate` (on by default): off, a `doubleclick` on a group with the Selection tool no longer isolates it.
 - `usePreciseCursors`: the Pen, Eyedropper, Slice and Blend tools' pointers are a crosshair.
+- `snapToPointTolerance` (1–8 px, 2 by default): with View › Snap to Point on and Smart Guides off (desktop app), the
+  point a selection is dragged by, a drawn point and a transform tool's reference point land on an anchor or a ruler
+  guide that near.
+- `moveLockedWithArtboard`: `artboard.move {moveArt: true}`, the Artboard tool and `artboard.rearrange` move locked and
+  hidden art with the artboard too; off (the default) it stays where it is.
+- `penRubberBand`, `curvatureRubberBand` (on by default): off, the Pen and Curvature tools draw no preview segment to
+  the pointer.
+- `showHandlesMultipleAnchors` (on by default): off, Direct Selection shows and drags direction handles only while a
+  single anchor is selected. `handleStyle` (`solid`, `hollow`, `large`) draws their ends (desktop app).
+- `hideCornerWidgetAbove` (177° by default): corners wider than this show no Live Corners widget (a rectangle's right
+  angles hide below 90°).
+- `transformPatternTiles` (off by default): the default of the transforms' `patterns` param (`object.transform`,
+  `object.move`, `object.rotate`, `object.scale`, `object.reflect`, `object.shear`, `object.transformEach`, the
+  Selection and transform tools, the dialogs' Transform Patterns): pattern fills and strokes move with the art.
+- `selectSameTintPercent` (off by default): `select.same.fillColor`, `strokeColor` and `fillAndStroke` take every tint
+  of a global or spot swatch; on, only the same tint.
 
 ```json
 {"name":"run_command","arguments":{"command":"prefs.set","params":{"key":"objectSelectionByPathOnly","value":true}}}
@@ -1128,6 +1144,23 @@ wheel zooms about the pointer, Shift-wheel scrolls up and down, Cmd/Ctrl-wheel s
 `ui.wheel` turns the wheel), `zoomToSelection` (on: Zoom In and Zoom Out centre the selection), `showToolTips`,
 `anchorSize` (1–7), `gridColor`, `gridStyle`, `gridsInBack`, `guideColor`, `guideStyle` and `recentFontsCount`.
 
+## Type preferences
+
+- `placeholderText` (on by default): type the Type tools place (`pointer_gesture` with `type`, `areaType`…) starts with
+  placeholder text, selected, so `type_text` replaces it; `text.create` and `text.createInPath` take `placeholder: true`.
+- `typeSizeIncrement`, `trackingIncrement`, `baselineShiftIncrement`: what `type.step {attribute: "size" | "leading" |
+  "tracking" | "kerning" | "baselineShift", by?}` steps by, on the text range given, the Type tool's selected text or the
+  selected type objects. `type.size.increase` / `type.size.decrease` (Cmd+Shift+. and Cmd+Shift+,) step the size; the
+  Type tool's Alt+arrows (`press_key {key: "Right", mods: {alt: true}}`) step kerning at a caret or tracking of the
+  selection (←/→), leading (↑/↓) and baseline shift (Shift+↑/↓), five steps with Cmd/Ctrl too.
+- `missingGlyphProtection` (on by default): `text.setStyle` and `text.setRangeStyle` changing the font leave the
+  characters the new font has no glyph for in the font that had one.
+
+```json
+{"name":"run_command","arguments":{"command":"prefs.set","params":{"values":{"typeSizeIncrement":4,"trackingIncrement":50}}}}
+{"name":"run_command","arguments":{"command":"type.step","params":{"attribute":"tracking","by":-2}}}
+```
+
 ## Width points
 
 `stroke.widthPoint.set {id, t, left, right, index?, adjustAdjoining?}` adds a width point (side widths in points) or,