4a11a9e3444f9bbfb747d1479848b55ba5b87e37
CollapsibleSection persists open/closed per section title via local-prefs. Container/Section/Columns drop the shorthand padding preset grid; the per-side Padding control expands a legacy shorthand and writes all four longhands in one undo step (new SpacingControl onChangeAll). Refs #35 Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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