feat: add inspection_expiry/has_etc/tire_type fields, icons in schedule view, and WebSocket real-time sync

Co-authored-by: pdf114514 <57948770+pdf114514@users.noreply.github.com>
Agent-Logs-Url: https://github.com/pdf114514/CarReservation/sessions/6d0f25ae-6db4-4937-ae2b-6674456a5ca1

frontend/src/components/TimelineView.jsx

@@ -31,7 +31,7 @@ function dateToStr(date) {
   return format(date, 'yyyy-MM-dd');
 }
 
-export default function TimelineView() {
+export default function TimelineView({ reloadKey = 0 }) {
   const [cars, setCars] = useState([]);
   const [reservations, setReservations] = useState([]);
   const [loading, setLoading] = useState(true);
@@ -75,7 +75,7 @@ export default function TimelineView() {
 
   useEffect(() => {
     loadData();
-  }, [loadData]);
+  }, [loadData, reloadKey]);
 
   // Close context menu on click / Escape
   useEffect(() => {