- Change dashed border buttons to solid filled style for better clickability
- Add signature progress bar with visual indicator
- Add signed users list showing who has already signed
- Convert Blast Radius section to collapsible panel (auto-open for CRITICAL)
- Convert Dry-Run Checks to collapsible panel with pass/fail summary badge
- Add slide-in animations for expanded content
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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