Keyboard Shortcuts: each Align and Distribute button of the Align panel can be given a key

Squashed from #3317 onto main.

docs/mcp.md

@@ -2312,6 +2312,18 @@ included. With `spacing: 0`, `object.distribute` puts every line on the guide. A
 everything where it is, as `object.align` does. `to: "selection"` or `"artboard"` distributes without the key guide
 as the key, as with `object.align`, and without `spacing` a key guide is spaced as any selected guide.
 
+Each button of the Align panel's Align Objects, Distribute Objects and Distribute Spacing rows is also a UI command
+that takes no params and runs what a click on the button runs: `align.horizontalLeft`, `align.horizontalCenter`,
+`align.horizontalRight`, `align.horizontalVerticalCenter`, `align.verticalTop`, `align.verticalCenter`,
+`align.verticalBottom`, `align.distributeVerticalTop`, `align.distributeVerticalCenter`,
+`align.distributeVerticalBottom`, `align.distributeHorizontalLeft`, `align.distributeHorizontalCenter`,
+`align.distributeHorizontalRight`, `align.distributeVerticalSpace` and `align.distributeHorizontalSpace`. The Align
+commands send `to: "key"` while the selection has a key, else `"artboard"` for one selected object without selected
+anchor points, else the Align To choice. The Distribute commands send `to: "key"` while the selection has a key, else
+the Align To choice, and while there is a key object or a key guide they send the panel's Distribute Spacing value as
+`spacing`. Edit › Keyboard Shortcuts lists them under Align, with no default shortcut, and
+`shortcuts.set {id, shortcut}` gives one a shortcut.
+
 The desktop app adds its active artboard, the one the Artboards panel highlights, to the `object.align`,
 `object.distribute`, `object.distributeSpacing` and `select.allOnArtboard` calls it runs without `artboard`, as it does
 for `edit.pasteInPlace`, `edit.pasteInFront` and `edit.pasteInBack`, and to each `command.batch`. A batch passes its