* Code cleanup
* Preparing model to include data needed for fiat display
* Displaying fiat amount and allowing switching between it and BTC
* Restoring parts removed by vibe coding
* Making ToFiatAmount method work for in wider variety of cases
* Tweaks for display and negative values
* Calculating amounts on serverside and simplifying
* Fix warnings
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Co-authored-by: nicolas.dorier <nicolas.dorier@gmail.com>
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