- SWToolButton appearance="pill": a non-blank string children is also
the native title; an explicit title wins and title="" turns it off;
numbers, JSX and arrays are never converted. text / document keep
passing only the given title. Accessible name, DOM and classes unchanged
- DESIGN_RULES §15: Header UX principles (ellipsis full text, icon-only
tool buttons, print class shared by pill, font-dependent widths, scope)
- Reference them from DESIGN_RULES §3·§9, COMPONENT_CATALOG §4·§11,
AI_USAGE §5.4, SW Header spec §17 and Step Header spec §12
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