Feat: Support all LNURLs via Popup - lnurlAuth

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Is your feature request related to a problem?

Split out from #1216

Describe the solution you'd like

Auth/login should work via prompt and via "Send" within the popup.
Main usecase is to i.e. login for your phone-account via Alby on desktop.

Describe alternatives you've considered

none

Additional context

none

Are you working on this?

No