* Fix off by small amounts in sent amount kaspa
Floating point math causes inconsistencies when converting kas to sompi.
Use a method that parses the amount as a string, the converts it to
sompi then parse back to uint64
* Deal with SendAmount as strings all the way
* Consistent config handling
* Set variables directly from utils.KasToSompi
Use = instead of := to ensure no shadowing
* Fix validate amount regex
* Use decimal places as defined by constants
Also check if SompiPerKaspa is multiple of 10
* Minor updates for context clarity
