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jubnl
900658de0a
The trip currency is the base every expense and settle-up is netted against, but the only picker for it lived in the legacy Budget addon panel — so on the Costs panel a trip was stuck with whatever it was created as. Add the field to the trip form, on create and on edit, gated on trip_edit. The REST and MCP write paths already accepted `currency`; only the form was missing. Changing it is not a rename, though: an expense's frozen `exchange_rate` is "units of its currency per 1 trip currency", and `currency = NULL` means "the trip's own", so both are relative to the outgoing base. Swapping it out from under them redenominates the implicit rows (9 000 RUB becoming 9 000 EUR) and leaves the frozen rates pointing at a currency the trip no longer uses — the same mismatch that inflated #1543. So rebaseTripCurrency() runs first, while the old currency is still on the row: it pins the implicit rows to the outgoing currency and re-freezes every rate against the incoming one, for expenses and settle-up transfers alike. No stored amount is rewritten — each keeps the figure the user typed, in the currency they typed it in, and its real-world value survives the switch. Also covers the #1543 data as a settlement regression test.