Reorder whole days and insert a day (#589) (#1148)

* feat(days): reorder whole days and insert a day at a position

Adds reorderDays + insertDay to the day service and a PUT /days/reorder route
(plus an optional position on create). Day rows stay stable so a day's
assignments, notes, bookings and accommodations ride along by id; on a dated
trip the calendar dates stay pinned to their slots while the content moves
across them, and each booking's date is re-stamped onto its day's new date
(time-of-day preserved) so day_id stays consistent. Renumbering uses the
two-phase write to avoid the UNIQUE(trip_id, day_number) collision, and a move
that would invert an accommodation's check-in/out span is rejected.

* feat(planner): reorder days from a toolbar popup, and add days

A new toolbar button opens a popup listing the days; drag a row by its grip or
use the up/down arrows to reorder, and add a day from there. Reorders apply
optimistically with rollback and sync over WebSocket; the day headers are left
untouched, so the existing place drop-targets are unaffected.

* i18n: add day-reorder strings across all languages

client/src/api/client.ts

@@ -18,7 +18,7 @@ import {
   type TripAddMemberRequest, type AssignmentReorderRequest,
   type PackingReorderRequest, type PackingCreateBagRequest, type TodoReorderRequest,
   type TripCreateRequest, type TripUpdateRequest, type TripCopyRequest,
-  type DayCreateRequest, type DayUpdateRequest,
+  type DayCreateRequest, type DayUpdateRequest, type DayReorderRequest,
   type PlaceCreateRequest, type PlaceUpdateRequest,
   type ReservationCreateRequest, type ReservationUpdateRequest,
   type AccommodationCreateRequest, type AccommodationUpdateRequest,
@@ -341,6 +341,7 @@ export const daysApi = {
   create: (tripId: number | string, data: DayCreateRequest) => apiClient.post(`/trips/${tripId}/days`, data).then(r => r.data),
   update: (tripId: number | string, dayId: number | string, data: DayUpdateRequest) => apiClient.put(`/trips/${tripId}/days/${dayId}`, data).then(r => r.data),
   delete: (tripId: number | string, dayId: number | string) => apiClient.delete(`/trips/${tripId}/days/${dayId}`).then(r => r.data),
+  reorder: (tripId: number | string, orderedIds: number[]) => apiClient.put(`/trips/${tripId}/days/reorder`, { orderedIds } satisfies DayReorderRequest).then(r => r.data),
 }
 
 export const placesApi = {