Persists the Balance-tab earnings settings: interval (0=Hour 1=Day 2=Month
3=Year, default Day), mode (0=Inflows 1=Net, default Inflows), display
format (0=Coin 1=Coin+fiat 2=Fiat, default Coin+fiat), a global show-all
toggle (default off), and an opt-in set of addresses whose earnings column
is shown when show-all is off. All values are clamped on load and saved,
mirroring the existing favorite/hidden address sets.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>