fix(trips): default a new trip to the user's currency setting (#1790)

The new-trip forms hard-coded EUR and ignored settings.default_currency,
so creating a trip always opened on EUR even with USD set in
Settings > General > Currency. Read default_currency (falling back to
EUR when unset) in both the desktop TripFormModal and the mobile
MNewTripSheet; edit mode still pre-fills the trip's own currency.

Fixes #1784

client/src/components/Trips/TripFormModal.test.tsx

@@ -5,6 +5,7 @@ import userEvent from '@testing-library/user-event';
 import { delay, http, HttpResponse } from 'msw';
 import { useAuthStore } from '../../store/authStore';
 import { useTripStore } from '../../store/tripStore';
+import { useSettingsStore } from '../../store/settingsStore';
 import { usePermissionsStore } from '../../store/permissionsStore';
 import { resetAllStores, seedStore } from '../../../tests/helpers/store';
 import { buildUser, buildTrip } from '../../../tests/helpers/factories';
@@ -397,6 +398,20 @@ describe('TripFormModal', () => {
     expect(onSave).toHaveBeenCalledWith(expect.objectContaining({ currency: 'EUR' }));
   });
 
+  it('FE-COMP-TRIPFORM-033b: a new trip defaults to the user\'s default_currency (#1784)', async () => {
+    seedStore(useSettingsStore, { settings: { ...useSettingsStore.getState().settings, default_currency: 'USD' } });
+    const user = userEvent.setup();
+    const onSave = vi.fn().mockResolvedValue({ trip: buildTrip({ id: 99 }) });
+    render(<TripFormModal {...defaultProps} onSave={onSave} />);
+
+    await user.type(screen.getByPlaceholderText(/Summer in Japan/i), 'New York 2026');
+    const submitBtn = screen.getAllByText('Create New Trip').find(el => el.closest('button'))!;
+    await user.click(submitBtn.closest('button')!);
+
+    await waitFor(() => expect(onSave).toHaveBeenCalled());
+    expect(onSave).toHaveBeenCalledWith(expect.objectContaining({ currency: 'USD' }));
+  });
+
   // Changing the start of a dated trip must go through the date-shift choice step (#1288).
   const changeStartDate = async (user: ReturnType<typeof userEvent.setup>, iso: string) => {
     await user.click(screen.getAllByRole('button', { name: 'Enter date manually' })[0]);

client/src/components/Trips/TripFormModal.tsx

@@ -4,6 +4,7 @@ import { Calendar, Camera, Search, X, UserPlus, Bell } from 'lucide-react'
 import { tripsApi, authApi } from '../../api/client'
 import CustomSelect from '../shared/CustomSelect'
 import { useAuthStore } from '../../store/authStore'
+import { useSettingsStore } from '../../store/settingsStore'
 import { useCanDo } from '../../store/permissionsStore'
 import { useToast } from '../shared/Toast'
 import { useTranslation } from '../../i18n'
@@ -42,6 +43,7 @@ export default function TripFormModal({ isOpen, onClose, onSave, trip, onCoverUp
   const toast = useToast()
   const { t } = useTranslation()
   const currentUser = useAuthStore(s => s.user)
+  const defaultCurrency = useSettingsStore(s => s.settings.default_currency) || 'EUR'
   const tripRemindersEnabled = useAuthStore(s => s.tripRemindersEnabled)
   const setTripRemindersEnabled = useAuthStore(s => s.setTripRemindersEnabled)
   const can = useCanDo()
@@ -93,7 +95,7 @@ export default function TripFormModal({ isOpen, onClose, onSave, trip, onCoverUp
       setCoverPreview(trip.cover_image || null)
       setCoverSearchQuery('')
     } else {
-      setFormData({ title: '', description: '', start_date: '', end_date: '', currency: 'EUR', reminder_days: tripRemindersEnabled ? 3 : 0, day_count: 7 })
+      setFormData({ title: '', description: '', start_date: '', end_date: '', currency: defaultCurrency, reminder_days: tripRemindersEnabled ? 3 : 0, day_count: 7 })
       setCustomReminder(false)
       setCoverPreview(null)
       setCoverSearchQuery('')

client/src/mobile/screens/dashboard/MNewTripSheet.tsx

@@ -3,6 +3,7 @@ import { Archive, ArchiveRestore, Camera, Search, X } from 'lucide-react'
 import { useTranslation } from '../../../i18n'
 import { tripsApi } from '../../../api/client'
 import { useCanDo } from '../../../store/permissionsStore'
+import { useSettingsStore } from '../../../store/settingsStore'
 import { useToast } from '../../../components/shared/Toast'
 import { normalizeImageFile } from '../../../utils/convertHeic'
 import { getApiErrorMessage } from '../../../types'
@@ -50,6 +51,7 @@ export default function MNewTripSheet({ open, trip, onClose, onSave, onCoverUpda
   const { t } = useTranslation()
   const toast = useToast()
   const can = useCanDo()
+  const defaultCurrency = useSettingsStore(s => s.settings.default_currency) || 'EUR'
   const fileRef = useRef<HTMLInputElement>(null)
   const coverSearchSeq = useRef(0)
   const canEditTrip = !isEditing || can('trip_edit', trip)
@@ -77,7 +79,7 @@ export default function MNewTripSheet({ open, trip, onClose, onSave, onCoverUpda
     setDescription(trip?.description || '')
     setStartDate(trip?.start_date || '')
     setEndDate(trip?.end_date || '')
-    setCurrency(trip?.currency || 'EUR')
+    setCurrency(trip?.currency || defaultCurrency)
     setCoverPreview(trip?.cover_image || null)
     setPendingCoverFile(null)
     setPendingUnsplashUrl(null)

client/tests/unit/mobile/dashboard/MNewTripSheet.test.tsx

@@ -5,6 +5,7 @@ import MNewTripSheet from '../../../../src/mobile/screens/dashboard/MNewTripShee
 import { tripsApi } from '../../../../src/api/client';
 import { useAuthStore } from '../../../../src/store/authStore';
 import { usePermissionsStore } from '../../../../src/store/permissionsStore';
+import { useSettingsStore } from '../../../../src/store/settingsStore';
 import { buildUser } from '../../../helpers/factories';
 import type { DashboardTrip } from '../../../../src/pages/dashboard/dashboardModel';
 import type { Trip, TripCreateRequest } from '@trek/shared';
@@ -75,6 +76,7 @@ beforeEach(() => {
 afterEach(() => {
   URL.createObjectURL = origCreateObjectURL;
   delete window.__addToast;
+  useSettingsStore.setState(s => ({ settings: { ...s.settings, default_currency: '' } }));
   vi.restoreAllMocks();
 });
 
@@ -88,6 +90,13 @@ describe('MNewTripSheet', () => {
     expect(screen.getByText('Add cover image')).toBeInTheDocument();
   });
 
+  it('FE-MOB-NTSH-001b: create mode defaults the currency to the user\'s default_currency (#1784)', () => {
+    useSettingsStore.setState(s => ({ settings: { ...s.settings, default_currency: 'USD' } }));
+    render(<MNewTripSheet open trip={null} onClose={() => {}} onSave={() => {}} />);
+
+    expect(screen.getByLabelText('currency')).toHaveValue('USD');
+  });
+
   it('FE-MOB-NTSH-002: edit mode preloads the trip and hides the no-date hint', () => {
     render(<MNewTripSheet open trip={buildDashTrip()} onClose={() => {}} onSave={() => {}} />);