Replaces the HTML5 datalist Input with a Popover + cmdk Combobox
modeled after CountryCombobox. Free-text on first entry via the
"Create '<typed value>'" item; past labels grouped under "Past trips"
with a check-mark indicating the current selection. Reuses the
existing /api/v1/expenses/trip-labels endpoint (distinct values for
the port, ordered by most-recent expense date) — no new schema or
service work.
Drops useQuery from expense-form-dialog since the combobox now owns
its own data fetch.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Matt
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