fix(plan): keep mobile plan panel open when opening day details

On mobile, tapping a day's title bar opened the day-detail view but also closed
the plan sidebar, forcing users to reopen it every time. The sidebar was closed
because the day-detail panel (z-50) would otherwise sit behind the mobile
sidebar overlay (z-9999). Lift the panel above the overlay on mobile and stop
closing the sidebar so the plan stays visible.

Closes #1015

client/src/components/Planner/DayDetailPanel.tsx

@@ -58,9 +58,10 @@ interface DayDetailPanelProps {
   rightWidth?: number
   collapsed?: boolean
   onToggleCollapse?: () => void
+  mobile?: boolean
 }
 
-export default function DayDetailPanel({ day, days, places, categories = [], tripId, assignments, reservations = [], lat, lng, onClose, onAccommodationChange, leftWidth = 0, rightWidth = 0, collapsed: collapsedProp = false, onToggleCollapse }: DayDetailPanelProps) {
+export default function DayDetailPanel({ day, days, places, categories = [], tripId, assignments, reservations = [], lat, lng, onClose, onAccommodationChange, leftWidth = 0, rightWidth = 0, collapsed: collapsedProp = false, onToggleCollapse, mobile = false }: DayDetailPanelProps) {
   const { t, language, locale } = useTranslation()
   const can = useCanDo()
   const tripObj = useTripStore((s) => s.trip)
@@ -174,7 +175,7 @@ export default function DayDetailPanel({ day, days, places, categories = [], tri
   const font = { fontFamily: "-apple-system, BlinkMacSystemFont, 'SF Pro Text', system-ui, sans-serif" }
 
   return (
-    <div className="fixed z-50" style={{ bottom: 'calc(var(--bottom-nav-h) + 20px)', left: `calc(${leftWidth}px + (100vw - ${leftWidth}px - ${rightWidth}px) / 2)`, transform: 'translateX(-50%)', width: `min(800px, calc(100vw - ${leftWidth}px - ${rightWidth}px - 32px))`, ...font }}>
+    <div className="fixed z-50" style={{ bottom: 'calc(var(--bottom-nav-h) + 20px)', left: `calc(${leftWidth}px + (100vw - ${leftWidth}px - ${rightWidth}px) / 2)`, transform: 'translateX(-50%)', width: `min(800px, calc(100vw - ${leftWidth}px - ${rightWidth}px - 32px))`, ...(mobile ? { zIndex: 10000 } : null), ...font }}>
       <div style={{
         background: 'var(--bg-elevated)',
         backdropFilter: 'blur(40px) saturate(180%)',

client/src/pages/TripPlannerPage.tsx

@@ -1003,6 +1003,7 @@ export default function TripPlannerPage(): React.ReactElement | null {
                   rightWidth={isMobile ? 0 : (rightCollapsed ? 0 : rightWidth)}
                   collapsed={dayDetailCollapsed}
                   onToggleCollapse={() => setDayDetailCollapsed(c => !c)}
+                  mobile={isMobile}
                 />
               )
             })()}
@@ -1116,7 +1117,7 @@ export default function TripPlannerPage(): React.ReactElement | null {
                   </div>
                   <div style={{ flex: 1, overflow: 'auto' }}>
                     {mobileSidebarOpen === 'left'
-                      ? <DayPlanSidebar tripId={tripId} trip={trip} days={days} places={places} categories={categories} assignments={assignments} selectedDayId={selectedDayId} selectedPlaceId={selectedPlaceId} selectedAssignmentId={selectedAssignmentId} onSelectDay={(id) => { handleSelectDay(id); setMobileSidebarOpen(null) }} onPlaceClick={(placeId, assignmentId) => { handlePlaceClick(placeId, assignmentId) }} onReorder={handleReorder} onUpdateDayTitle={handleUpdateDayTitle} onAssignToDay={handleAssignToDay} onRouteCalculated={(r) => { if (r) { setRoute(r.coordinates); setRouteInfo({ distance: r.distanceText, duration: r.durationText }) } }} reservations={reservations} visibleConnectionIds={visibleConnections} onToggleConnection={toggleConnection} onAddReservation={(dayId) => { setEditingReservation(null); tripActions.setSelectedDay(dayId); setShowReservationModal(true); setMobileSidebarOpen(null) }} onAddPlace={() => { setEditingPlace(null); setShowPlaceForm(true); setMobileSidebarOpen(null) }} onDayDetail={(day) => { setShowDayDetail(day); setSelectedPlaceId(null); selectAssignment(null); setMobileSidebarOpen(null) }} accommodations={tripAccommodations} onNavigateToFiles={() => { setMobileSidebarOpen(null); handleTabChange('dateien') }} onExpandedDaysChange={setExpandedDayIds} pushUndo={pushUndo} canUndo={canUndo} lastActionLabel={lastActionLabel} onUndo={handleUndo} onEditTransport={can('day_edit', trip) ? (reservation) => { setEditingTransport(reservation); setTransportModalDayId(reservation.day_id ?? null); setShowTransportModal(true); setMobileSidebarOpen(null) } : undefined} onEditReservation={can('reservation_edit', trip) ? (r) => { setEditingReservation(r); setShowReservationModal(true); setMobileSidebarOpen(null) } : undefined} initialScrollTop={mobilePlanScrollTopRef.current} onScrollTopChange={(top) => { mobilePlanScrollTopRef.current = top }} />
+                      ? <DayPlanSidebar tripId={tripId} trip={trip} days={days} places={places} categories={categories} assignments={assignments} selectedDayId={selectedDayId} selectedPlaceId={selectedPlaceId} selectedAssignmentId={selectedAssignmentId} onSelectDay={(id) => { handleSelectDay(id); setMobileSidebarOpen(null) }} onPlaceClick={(placeId, assignmentId) => { handlePlaceClick(placeId, assignmentId) }} onReorder={handleReorder} onUpdateDayTitle={handleUpdateDayTitle} onAssignToDay={handleAssignToDay} onRouteCalculated={(r) => { if (r) { setRoute(r.coordinates); setRouteInfo({ distance: r.distanceText, duration: r.durationText }) } }} reservations={reservations} visibleConnectionIds={visibleConnections} onToggleConnection={toggleConnection} onAddReservation={(dayId) => { setEditingReservation(null); tripActions.setSelectedDay(dayId); setShowReservationModal(true); setMobileSidebarOpen(null) }} onAddPlace={() => { setEditingPlace(null); setShowPlaceForm(true); setMobileSidebarOpen(null) }} onDayDetail={(day) => { setShowDayDetail(day); setSelectedPlaceId(null); selectAssignment(null) }} accommodations={tripAccommodations} onNavigateToFiles={() => { setMobileSidebarOpen(null); handleTabChange('dateien') }} onExpandedDaysChange={setExpandedDayIds} pushUndo={pushUndo} canUndo={canUndo} lastActionLabel={lastActionLabel} onUndo={handleUndo} onEditTransport={can('day_edit', trip) ? (reservation) => { setEditingTransport(reservation); setTransportModalDayId(reservation.day_id ?? null); setShowTransportModal(true); setMobileSidebarOpen(null) } : undefined} onEditReservation={can('reservation_edit', trip) ? (r) => { setEditingReservation(r); setShowReservationModal(true); setMobileSidebarOpen(null) } : undefined} initialScrollTop={mobilePlanScrollTopRef.current} onScrollTopChange={(top) => { mobilePlanScrollTopRef.current = top }} />
                       : <PlacesSidebar tripId={tripId} places={places} categories={categories} assignments={assignments} selectedDayId={selectedDayId} selectedPlaceId={selectedPlaceId} onPlaceClick={(placeId) => { handlePlaceClick(placeId); setMobileSidebarOpen(null) }} onAddPlace={() => { setEditingPlace(null); setShowPlaceForm(true); setMobileSidebarOpen(null) }} onAssignToDay={handleAssignToDay} onEditPlace={(place) => { setEditingPlace(place); setEditingAssignmentId(null); setShowPlaceForm(true); setMobileSidebarOpen(null) }} onDeletePlace={(placeId) => handleDeletePlace(placeId)} onBulkDeletePlaces={(ids) => setDeletePlaceIds(ids)} onBulkDeleteConfirm={(ids) => confirmDeletePlaces(ids)} days={days} isMobile onCategoryFilterChange={setMapCategoryFilter} onPlacesFilterChange={setMapPlacesFilter} pushUndo={pushUndo} initialScrollTop={mobilePlacesScrollTopRef.current} onScrollTopChange={(top) => { mobilePlacesScrollTopRef.current = top }} />
                     }
                   </div>