cashu wallet and payments

Changelog and package.json version bump

UI upgrade, ndk upgrade, network stability fixes

user handling: huge refactor. changed to $currentUser approach and dr…

…opped $ndk.activeUser approach which was very unstable

- current user store in stores/login.ts
- profile fetch happens in initializeUser() in utilities/helpers.ts
- reactivity is much easier handled with the dedicated store approach than relying on ndk.activeUser
- ndk.activeUser is not very helpful right now, have not seen projects use this

Messages: Save selected contact to reselect that after renavigating b…

…ack to messages

Feedback implemented. Tags @Five in post and adds appropriate hashtags

Fixed wrong 'start_url' member in manifest.webmanifest and manifest.json

First version to deploy for live demo purposes

Login polished, basic relay handling, UI mostly responsive, private c…

…hat(search not yet done)

only chat left for bare minimum mvp, not thoroughly tested though