New Feature: Wallet Mode

[X-Hades-X]

I figured it would be cool to have the ability to set an amount in the App if scanning an LN-Address. With this capability it was then just a bit more work to implement a full wallet mode. The User can scan his Bolt Card and use the LNURLw and LNURLp that can be requested from the Service as Pay/Recieve of a temporary Wallet.

You can find my implementation on my main branch https://github.com/X-Hades-X/boltcard-tools-terminal/tree/main

What already works:

• Scanning of LNURLs and LN-Addresses with no specific amount -> Loaded as "Recieving only" Wallet (it is somehow confusing UX for now)
• Scanning of the Bolt Card to open a temporary Wallet
• Choosing a currency and calculating the Sat amount according to the exchange rate
• Floating point number for amounts in Fiat or BTC (SATs are Integer, are there currencies without cents? does it matter?)

Future improvements:

• Splitting the Wallet into two screens

  1. User chooses if he wants to pay or recieve on the first screen
  2. Amount with limits is entered on a second screen

  If a LN-Address or LNURLp is scanned the screen would show only the Address/Description and a "Pay" Button
  else a Bolt Card is scanned and it shows the Description from the Bolt Card, a "Pay" and "Recieve" Button

• Using the same "Invoice" Screen for Pay/Recieve (adding a title to the screen to differentiate)

• Supporting BTC Address without specified amount (for swap)