- Split single Zap button into Zap (⚡ Lightning) and Nutzap (🥜 Cashu) buttons
- Each button has its own count display and popup dialog
- Zap button: only sends Lightning zaps via Cashu melt, simplified dialog (no rail selector)
- Nutzap button: sends NIP-61 nutzaps, dialog shows recipient's accepted mints
- Removed capability badges (buttons themselves show capability via dimming)
- Removed separate nutzap count display (count now on Nutzap button)
- Added applyZapCapabilityDimming() — dims buttons based on resolveZapCapabilities
- Added promptNutzapDetails() to zaps.mjs — shows recipient mints and shared mint info
- Simplified promptZapDetails() — removed rail selector, Lightning only
- Added .interaction-item.nutzap and .dimmed CSS styles
- All colors use CSS variables only
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