Add Spanish, French, Portuguese, German translations to all UI strings.
Fix language switching in Avalonia compiled bindings: instead of firing
PropertyChanged("Item[]") on a singleton (which Avalonia ignores when the
object reference is unchanged), Loc.SwitchTo() now creates a new Loc
instance for the selected language and replaces both Loc.Instance and the
ViewModel's _loc field. OnPropertyChanged("Loc") then forces Avalonia to
re-evaluate all {Binding Loc[key]} bindings with the new instance.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add global AppConfig (config.json, blueprint §8) persisting language
and amount unit. CoinAmount gains unit-aware formatting and parsing
(PLM, mPLM, µPLM, sat), applied everywhere amounts are shown or
entered, including the send form. New Loc i18n layer (it/en) with
live-updating XAML bindings covering menu, wizard, wallet panel and
status messages.
The Impostazioni menu opens a dropdown with separate Lingua and Unità
entries (radio-checked submenus, applied and saved on click), ready to
host future settings.
davide