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Implements the foundational structure for sending Lightning zaps (NIP-57) to Nostr users and events. This commit adds the command interface, UI components, and routing logic. The actual LNURL resolution and zap request creation will be implemented in follow-up commits. Components Added: - ZapWindow: Full-featured UI for zapping with amount presets, custom amounts, wallet integration, and QR code fallback - parseZapCommand: Parser supporting multiple formats (npub, nprofile, nevent, naddr, NIP-05, $me alias) - Command registration in man pages with examples - Window routing and title generation Features: - Preset amount buttons (21, 100, 500, 1000, 5000, 10000 sats) - Custom amount input - Amount usage tracking (remembers most-used amounts) - Comment field for zap messages - Event context rendering (shows zapped event in UI) - Dual payment methods: NWC wallet or QR code/invoice copy - Dynamic recipient resolution (from event author if zapping event) Usage: zap fiatjaf.com # Zap a user by NIP-05 zap npub1... # Zap a user by npub zap nevent1... # Zap an event (recipient = author) zap npub1... nevent1... # Zap specific user for specific event Next Steps: - Implement LNURL-pay resolution (fetch callback URL and nostrPubkey) - Create kind 9734 zap request event with applesauce factory - Implement invoice generation via LNURL callback - Integrate NWC wallet payment - Add zap action to event context menus - Implement zap receipt listening (kind 9735)