fix(journey,pdf): journey reorder sort_order + PDF multi-day transport (#848)

* fix(journey): make sort_order authoritative for within-day entry ordering

Reorder buttons appeared broken because the server ORDER BY put entry_time
before sort_order, so entries synced from trip places with differing times
would always sort by time regardless of sort_order writes. The client store
mirrored the same comparator, making even the optimistic update invisible.

- Change ORDER BY to (entry_date, sort_order, id) in getJourneyFull and listEntries
- Fix syncTripPlaces and onPlaceCreated to assign MAX+1 sort_order per day instead of day_number/0
- Update client store comparator to match
- Add DB migration to backfill sort_order using old effective key (entry_time, id) so existing journeys retain their visual order
- Add tests: JOURNEY-SVC-089–093, FE-STORE-JOURNEY-018–019

Closes #846

* fix(pdf): include multi-day transport return/arrival in PDF itinerary (#847)

Reservations were matched to days by pickup date only, so the end-day
card (e.g. car Return, flight Arrival) was silently dropped from the PDF.
Add span-aware helpers mirroring DayPlanSidebar logic: match by day_id/end_day_id
span, show reservation_end_time on end days, prefix title with phase label
(Return/Arrival/etc.), and use per-day position for sort order.

* test(pdf): add missing day_id to transport reservation fixture

client/src/store/journeyStore.ts

@@ -223,10 +223,8 @@ export const useJourneyStore = create<JourneyState>((set, get) => ({
       )
       entries.sort((a, b) => {
         if (a.entry_date !== b.entry_date) return a.entry_date.localeCompare(b.entry_date)
-        const atime = a.entry_time || ''
-        const btime = b.entry_time || ''
-        if (atime !== btime) return atime.localeCompare(btime)
-        return (a.sort_order || 0) - (b.sort_order || 0)
+        if (a.sort_order !== b.sort_order) return (a.sort_order || 0) - (b.sort_order || 0)
+        return a.id - b.id
       })
       return { current: { ...s.current, entries } }
     })