Add SearchBar molecule — search input with optional submit button
- Composes Input + IconButton + Button for provider/venue search
- Enter-to-submit, progressive clear button, inline loading spinner
- Two sizes aligned with Input/Button (medium 48px, small 40px)
- Guards empty submissions, refocuses input after clear
- role="search" landmark for screen reader navigation
- Critique: 35/40 — P2 fixes applied (empty submit, inline loading, refocus)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Richie
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