feat(transport): add bus, taxi, bicycle, ferry and other transport types (#1105)

Closes #718. Adds five new transport reservation types alongside the
existing flight/train/car/cruise: bus, taxi, bicycle, ferry and a generic
'transport_other' catch-all. The new types are treated as first-class
transports everywhere — the transport modal, day plan, route calculation,
map overlays, file grouping and the PDF export — and are translated across
all 20 locales.

A dedicated 'transport_other' value is used for the catch-all so existing
'other' bookings are not reclassified as transport.

shared/src/i18n/gr/reservations.ts

@@ -55,6 +55,11 @@ const reservations: TranslationStrings = {
   'reservations.type.event': 'Εκδήλωση',
   'reservations.type.tour': 'Περιήγηση',
   'reservations.type.other': 'Άλλο',
+  'reservations.type.bus': 'Λεωφορείο',
+  'reservations.type.ferry': 'Φέρι',
+  'reservations.type.bicycle': 'Ποδήλατο',
+  'reservations.type.taxi': 'Ταξί',
+  'reservations.type.transport_other': 'Άλλο',
   'reservations.confirm.delete':
     'Είστε σίγουροι ότι θέλετε να διαγράψετε την κράτηση "{name}";',
   'reservations.confirm.deleteTitle': 'Διαγραφή κράτησης;',