ecash payments reactivated

Improved question icon shape, still not good placement

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