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ae71bcfd1e
Costs already resolved `default_currency || trip.currency || 'EUR'`, but the setting could never actually be empty: the store seeded 'USD', so a user who had never touched it silently had every trip converted into dollars, and the picker offered no way to unset it. Seed it empty and lead the picker with a "Trip currency" option, so an unset preference means "show each trip in its own currency" instead of forcing them all through one code. An explicit empty value persists and beats the admin-set instance default — it is a deliberate choice, not an absence. This also brings the public share's fallback to life: the share payload has resolved sharer's currency -> trip currency since #1361, but the trip-currency branch was unreachable while every owner had a currency forced on them. Plugins are handed `formats.currency` as a concrete code, so PluginFrame now resolves the same chain rather than passing an empty string through the bridge.