The Currency/Date-format dropdowns were decorative (nothing read them). Wire
them into the formatters, display-only (single active currency, no conversion):
- money.ts: activeCurrency/activeLocale read synchronously from localStorage at
load (correct first paint), setMoneyFormat() write-through; formatUSD/
formatUSDWhole/formatCentsUSD honor them. Default USD/en-US is byte-identical,
so money.test + the probe stay green.
- utils.ts: fmtDate honors an activeDateFormat (MM/DD/YYYY | DD/MM/YYYY |
YYYY-MM-DD) with setDateFormat() write-through.
- FormatSync (mounted in Layout) reconciles the server settings → localStorage/
module and re-renders once only on a genuine cross-device divergence.
- Settings selects write through on change, currency list expanded (AUD/CHF/JPY/
INR), "Regional" section, tooltips clarifying display-only.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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