Blend: Window › Blend opens a Blend panel with the blend's spacing, orientation and commands

The reference app has a Blend panel, opened with Window > Blend, that
makes and edits blends in one place. VectorCraft had the Blend tool,
Object › Blend and the Blend Options dialog, but no Blend panel.

Window › Blend opens a panel with Make, the selected blend's Spacing and
Orientation, Reverse Front to Back, Reverse Spine, Replace Spine, Expand
and Release. Each control runs its Object › Blend command, so a change
of the selected blend's spacing or orientation shows on the canvas at
once and is one undo step. With two or more objects selected and no
blend, Spacing and Orientation set the options new blends start with,
as Blend Options does. Make is dimmed until two or more objects are
selected. Spacing and Orientation are dimmed until a blend or two or
more objects are selected, and the other buttons are dimmed until a
blend is selected. The Blend Options dialog's orientation toggles now
have names for screen readers.

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

docs/ui-parity.md

@@ -214,7 +214,7 @@ panel-menu commands such as Break Link to Symbol), so they can be given shortcut
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-| Blend panel (30.7) | missing | Blend Options dialog exists |
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