Blend Options is a dedicated dialog (Spacing dropdown with its value,
Align to Page / Align to Path buttons, live preview) opened on the
selected blend's own options, so OK no longer turns Smooth Color into
5 steps; with nothing selected it sets what new blends start with
(object.blend.info reads them). The Blend tool blends from clicked
anchor points (blend spec `starts`), adds keys to an existing blend
instead of nesting it, opens Blend Options on double-click, Alt-click
and its toolbar button, and has its own cursors and hint.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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