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.

client/src/components/Planner/DayPlanSidebar.tsx

@@ -1608,7 +1608,7 @@ const DayPlanSidebar = React.memo(function DayPlanSidebar(props: DayPlanSidebarP
                                       </button>
                                     )}
                                     {canEditDays && (() => {
-                                      const isTransport = ['flight','train','car','cruise','bus'].includes(res.type)
+                                      const isTransport = TRANSPORT_TYPES.has(res.type)
                                       const handler = isTransport ? onEditTransport : onEditReservation
                                       if (!handler) return null
                                       return (