feat: Thêm nút định vị người dùng trên bản đồ điều hướng mobile

- Thêm nút 'Vị trí của tôi' ở góc dưới bên trái bản đồ
- Khi bật: map tự động center theo vị trí GPS của người dùng (dùng watchPosition)
- Cho phép thu phóng tự do ngay cả khi đang định vị
- Khi người dùng kéo thả bản đồ thủ công: tự động tắt chế độ định vị
- Nút hoạt động độc lập với nút la bàn (compass)
- Sửa import leaflet.css bị lỗi path

frontend/src/pages/TourNavigationPage.tsx

@@ -114,8 +114,6 @@ const MapSizeHandler = ({ mapRef }: { mapRef: React.MutableRefObject<L.Map | nul
 
       if ((prev && (Math.abs(newWidth - prev.width) > 2 || Math.abs(newHeight - prev.height) > 2)) || newWidth === 0 || newHeight === 0) {
         prevSizeRef.current = { width: newWidth, height: newHeight };
-        const prevZoom = map.getZoom();
-        const prevCenter = map.getCenter();
         const userZoom = (map as any)._userZoomLevel as number | undefined;
         
         map.invalidateSize({ animate: false });
@@ -135,6 +133,7 @@ const MapSizeHandler = ({ mapRef }: { mapRef: React.MutableRefObject<L.Map | nul
 
 export const TourNavigationPage: React.FC<TourNavigationPageProps> = ({ tourId, routeData, onBack }) => {
   const [isCompassActive, setIsCompassActive] = useState(false);
+  const [isLocatingUser, setIsLocatingUser] = useState(false);
   const [currentHeading, setCurrentHeading] = useState(0);
   const [routeGeometry, setRouteGeometry] = useState<[number, number][] | null>(null);
   const [error, setError] = useState<string | null>(null);
@@ -149,6 +148,49 @@ export const TourNavigationPage: React.FC<TourNavigationPageProps> = ({ tourId,
   const destLat = routeData?.destination?.lat;
   const destLng = routeData?.destination?.lng;
 
+  const stopLocating = useCallback(() => {
+    setIsLocatingUser(false);
+  }, []);
+
+  useEffect(() => {
+    const map = mapRef.current;
+    if (!map) return;
+
+    const onMoveStart = () => {
+      if (isLocatingUser) {
+        stopLocating();
+      }
+    };
+    map.on('movestart', onMoveStart);
+    return () => {
+      map.off('movestart', onMoveStart);
+    };
+  }, [isLocatingUser, stopLocating]);
+
+  useEffect(() => {
+    if (!isLocatingUser || !mapRef.current) return;
+
+    if (navigator.geolocation) {
+      watchIdRef.current = navigator.geolocation.watchPosition(
+        (position) => {
+          if (mapRef.current) {
+            const currentZoom = mapRef.current.getZoom();
+            mapRef.current.setView([position.coords.latitude, position.coords.longitude], currentZoom, { animate: true });
+          }
+        },
+        (err) => console.error("User location tracking error:", err),
+        { enableHighAccuracy: true }
+      );
+    }
+
+    return () => {
+      if (watchIdRef.current !== null) {
+        navigator.geolocation.clearWatch(watchIdRef.current);
+        watchIdRef.current = null;
+      }
+    };
+  }, [isLocatingUser]);
+
   useEffect(() => {
     if (!routeData || !originLat || !originLng || !destLat || !destLng) {
       setRouteGeometry(null);
@@ -245,9 +287,9 @@ export const TourNavigationPage: React.FC<TourNavigationPageProps> = ({ tourId,
 
   const destIcon = useMemo(() => L.divIcon({
     className: '!bg-transparent !border-none',
-    html: `<div class="w-8 h-8 bg-red-600 rounded-full border-2 border-white shadow-xl flex items-center justify-center text-white text-xs font-black">Đ</div>`,
-    iconSize: [32, 32],
-    iconAnchor: [16, 16]
+    html: `<div class="w-10 h-10 bg-red-600 rounded-full border-2 border-white shadow-xl flex items-center justify-center text-white text-xs font-black">Đ</div>`,
+    iconSize: [40, 40],
+    iconAnchor: [20, 20]
   }), []);
 
   if (!routeData) return null;
@@ -256,6 +298,22 @@ export const TourNavigationPage: React.FC<TourNavigationPageProps> = ({ tourId,
     ? [(routeData.origin.lat + routeData.destination.lat) / 2, (routeData.origin.lng + routeData.destination.lng) / 2]
     : [0, 0];
 
+  const centerOnUser = () => {
+    if (navigator.geolocation) {
+      navigator.geolocation.getCurrentPosition(
+        (position) => {
+          if (mapRef.current) {
+            const currentZoom = mapRef.current.getZoom();
+            mapRef.current.setView([position.coords.latitude, position.coords.longitude], currentZoom, { animate: true });
+            canFitRef.current = false;
+          }
+        },
+        (err) => console.error("Cannot get user location:", err),
+        { enableHighAccuracy: true }
+      );
+    }
+  };
+
   return (
     <div className="fixed inset-0 bg-slate-950 flex flex-col overflow-hidden select-none text-white antialiased">
       <div className="w-full bg-[#1e293b]/95 backdrop-blur-md border-b border-slate-800 px-4 py-3.5 flex items-center gap-3 z-50 shrink-0">
@@ -289,7 +347,7 @@ export const TourNavigationPage: React.FC<TourNavigationPageProps> = ({ tourId,
           <TileLayer url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png" attribution="" />
           <MapRefSetter mapRef={mapRef} />
           <MapInteractionWatcher />
-          <FitBounds coords={routeGeometry || []} canFitRef={canFitRef} />
+          {/* <FitBounds coords={routeGeometry || []} canFitRef={canFitRef} /> */}
           {routeGeometry && (
             <Polyline positions={routeGeometry} color="#2563eb" weight={6} opacity={0.9} smoothFactor={1} />
           )}
@@ -298,6 +356,27 @@ export const TourNavigationPage: React.FC<TourNavigationPageProps> = ({ tourId,
           <CompassInteractionDetector onUserInteraction={handleUserInteraction} />
         </MapContainer>
 
+        {/* Locate User Button */}
+        <button
+          onClick={() => {
+            setIsLocatingUser(!isLocatingUser);
+            if (!isLocatingUser) {
+              centerOnUser();
+            }
+          }}
+          className={`absolute bottom-8 left-6 z-[999] w-14 h-14 rounded-full border-2 flex items-center justify-center shadow-2xl transition-all active:scale-95 ${
+            isLocatingUser
+              ? 'bg-blue-600 border-blue-400 text-white animate-pulse'
+              : 'bg-white dark:bg-slate-900 border-slate-200 dark:border-slate-700 text-slate-600 dark:text-blue-400'
+          }`}
+          title="Vị trí của tôi"
+        >
+          <svg width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+            <circle cx="12" cy="12" r="3" />
+            <path d="M12 2v4M12 18v4M2 12h4M18 12h4" />
+          </svg>
+        </button>
+
         <button
           onClick={() => setIsCompassActive(!isCompassActive)}
           className={`absolute bottom-8 right-6 z-[999] w-14 h-14 rounded-full border-2 flex items-center justify-center shadow-2xl transition-all active:scale-95 ${