Created useFormatters() combining useWeightUnit + useCurrency + formatWeight/formatPrice
into a single hook returning weight(grams) and price(cents) bound functions plus
raw unit and currency values. Updated all 14 consumer files to use the new hook,
removing the repeated 4-import + 2-hook-call pattern from each.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
