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)