ZAP with Lightning wallet

# Description

We have a NWC screen to use a LN Wallet and a screen for it ZAP with Lightning wallet.
Also we have a modal for zap directly through Nostr note.
Looks npubcash for LUD generation for this Nostr address: https://github.com/cashubtc/npubcash-server

Improve the overall UI and UX of it.
Fix the zap through the Tip modal for ZAP

TODO

- [ ] Link NWC URL of Lightning wallet to a Nostr address
- [ ] NWC connection
- [ ] NWC connection with Cashu?
- [ ] LN address creation and management: cashu.space or others to put un the lud6 profile attribute in Nostr (based on NIP-5)
- [ ] Fix tip ln invoice in Zap.
- [ ] Fix css ui of the Lightning screens.
- [ ] Nostr wallet connect NIP-47.