* feat: add max decimal handling for crypto amounts and test coverage
* fix: correct decimal point handling in `withMaxDecimals` and update related test
* fix: ensure amount formatting aligns with selected currency decimals in ReceivePage
* fix: ensure amount controller syncs with ViewModel in AddressPage and ReceivePage
* feat: add support for currency decimals and streamline amount handling logic
* fix: ensure crypto and fiat amounts sync correctly in Send ViewModel