fix(dayplan): resolve duplicate reservation display, date off-by-one, and missing day_id on edit

- Exclude place-assigned reservations from timeline to prevent duplicate display
- Use selected day's date instead of today when entering time without date
- Pass day_id when updating reservations, not only when creating

client/src/components/Planner/DayPlanSidebar.tsx

@@ -248,8 +248,10 @@ const DayPlanSidebar = React.memo(function DayPlanSidebar({
   const getTransportForDay = (dayId: number) => {
     const day = days.find(d => d.id === dayId)
     if (!day?.date) return []
+    const dayAssignmentIds = (assignments[String(dayId)] || []).map(a => a.id)
     return reservations.filter(r => {
       if (!r.reservation_time || r.type === 'hotel') return false
+      if (r.assignment_id && dayAssignmentIds.includes(r.assignment_id)) return false
       const startDate = r.reservation_time.split('T')[0]
       const endDate = getEndDate(r)
 

client/src/components/Planner/ReservationModal.tsx

@@ -385,7 +385,8 @@ export function ReservationModal({ isOpen, onClose, onSave, reservation, days, p
                 value={(() => { const [, t] = (form.reservation_time || '').split('T'); return t || '' })()}
                 onChange={t => {
                   const [d] = (form.reservation_time || '').split('T')
-                  const date = d || new Date().toISOString().split('T')[0]
+                  const selectedDay = days.find(dy => dy.id === selectedDayId)
+                  const date = d || selectedDay?.date || new Date().toISOString().split('T')[0]
                   set('reservation_time', t ? `${date}T${t}` : date)
                 }}
               />

client/src/pages/TripPlannerPage.tsx

@@ -431,7 +431,7 @@ export default function TripPlannerPage(): React.ReactElement | null {
   const handleSaveReservation = async (data) => {
     try {
       if (editingReservation) {
-        const r = await tripActions.updateReservation(tripId, editingReservation.id, data)
+        const r = await tripActions.updateReservation(tripId, editingReservation.id, { ...data, day_id: selectedDayId || null })
         toast.success(t('trip.toast.reservationUpdated'))
         setShowReservationModal(false)
         if (data.type === 'hotel') {