Document: Cmd+Alt+Shift+U switches to the next unit of measurement

The reference app switches the units of measurement with
Ctrl+Alt+Shift+U on Windows and Option+Shift+Command+U on macOS.
VectorCraft could set the document's units with document.setUnits or
a right-click on a ruler, but no command stepped through them and no
key did it.

document.switchUnits (Switch Units, default Cmd+Alt+Shift+U) sets the
document's units to the next one in the order a right-click on a
ruler lists them: Points, Picas, Inches, Millimeters, Centimeters,
Pixels, Feet & Inches, Meters, Yards, Feet, and from Feet back to
Points. Each press is one undo step, and the reply names the new
units. Keyboard Shortcuts lists it under Document.

The precise cursors shortcut-editor test used Cmd+Alt+Shift+U as a
free key; it now uses Cmd+Alt+Shift+Q.

Docs: docs/mcp.md, docs/ui-parity.md, docs/target-app-parity.md.

docs/mcp.md

@@ -3075,6 +3075,9 @@ three: General (rulers, positions and sizes, the Info panel, dialog distances, c
 (`document.inspect` → `units`): `document.setUnits {units}` (Document Setup) sets it for that document, and
 `prefs.set {key: "unitsGeneral", value}` sets it for the active document too (one undo step) and is the units
 `file.new` starts in when it gets no `units`. Stroke and Type are the preferences `unitsStroke` and `unitsType`.
+`document.switchUnits` (Cmd/Ctrl+Alt+Shift+U) sets the active document's units to the next unit in the order a
+right-click on a ruler lists them (Points, Picas, Inches, Millimeters, Centimeters, Pixels, Feet & Inches, Meters,
+Yards, Feet, then Points again), in one undo step, and replies `{units}`.
 `numbersWithoutUnitsArePoints` (on by default) makes the desktop app's length fields in picas read a number typed
 with no unit in points (`12` is 12 pt, `2p6` and `1p` stay picas, `12 mm` millimetres); off, it is in picas. Fields in
 other units read it in their unit either way, and the Preferences dialog dims the option unless a unit is Picas.

docs/target-app-parity.md

@@ -610,6 +610,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   - F8 (`ui.symbolOptions`) opens Symbol Options for a new symbol made from the selection, as the Symbols panel's New Symbol button does, on the key the reference app's [Default keyboard shortcuts](https://web.archive.org/web/20260726060015/https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html) page lists for making a new symbol. OK makes the symbol and puts an instance of it in place of the art, and Cancel makes none. With nothing selected, F8 opens no dialog, and the status bar says that nothing is selected. Shift+F8 and Cmd/Ctrl+F8 still show the Transform and Info panels.
   - Cmd/Ctrl+Shift+X (`type.resetHorizontalScale`) sets the horizontal scale of the selected type, or of the text the Type tool has selected, to 100% as the Character panel shows it (the object's own stretch included), in one undo step; at a caret it leaves the text as it is.
   - Cmd/Ctrl+Alt+N (`file.newWithoutDialog`) makes a document without opening the New Document dialog, on the key the reference app's [Default keyboard shortcuts](https://web.archive.org/web/20260726060015/https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html) page lists for making a new document with no New Document dialog box. The page does not say which settings the document gets. VectorCraft gives it the settings the dialog opens on (the first Recent entry, or the Print category's Letter while Recent is empty) and the next untitled name.
+  - Cmd/Ctrl+Alt+Shift+U (`document.switchUnits`) switches the document to the next unit of measurement, in one undo step, on the key the reference app's [Default keyboard shortcuts](https://web.archive.org/web/20260726060015/https://helpx.adobe.com/illustrator/using/default-keyboard-shortcuts.html) page lists for switching units of measurement. The page does not give an order. VectorCraft steps through the units in the order a right-click on a ruler lists them (Points, Picas, Inches, Millimeters, Centimeters, Pixels, Feet & Inches, Meters, Yards, Feet) and goes from Feet back to Points.
   - Shortcut sets other apps save as text (`.kys`) open in Import Shortcut Set from File › Open, from Edit › Keyboard Shortcuts › Import… in the desktop app, or from a drop on the window. It matches each entry to a tool, command or panel by name and decodes the file's key and modifier codes where VectorCraft's default shortcuts agree on them; the user answers the rest, and Apply fills the Keyboard Shortcuts dialog's working set. The answers are kept with the preferences for the next import (`shortcutSet.read`, `importMatches.*`).
   - On Windows and Linux the app bar is the window's title bar (its own minimize, maximize and close buttons, drag to move, edges to resize), with the dragon app icon as the brand mark; dialogs and menus size to their content. As on a native menu bar, once one menu is open, moving the pointer onto another title opens that one.
   - On Windows a maximized window stays inside the work area with the taskbar on any edge (#3242, #3723).

docs/ui-parity.md

@@ -255,6 +255,9 @@ Cmd/Ctrl+Alt+N (`file.newWithoutDialog`, New Without Dialog in the shortcut edit
 settings the New Document dialog opens on (the first Recent entry, or the Print category's Letter while Recent is
 empty), without opening the dialog.
 
+Cmd/Ctrl+Alt+Shift+U (`document.switchUnits`, Switch Units in the shortcut editor) switches the document to the
+next unit in the order a right-click on a ruler lists them, from Feet back to Points.
+
 ## Panels, Control bar, Properties, context menus
 
 | Interaction | Status | Evidence |