fix: polyline decoding bug with large bounds and fix ulys API toll pricing precision

em2rp/lib/views/widgets/common/route_map_widget.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:latlong2/latlong.dart';
 import 'package:em2rp/models/route_result_model.dart';
+import '../../../utils/polyline_utils.dart';
 
 /// Affiche 1 ou 2 itinéraires sur une carte OpenStreetMap.
 /// Route TOLL = bleu, Route TOLL_FREE = vert.
@@ -15,41 +16,8 @@ class RouteMapWidget extends StatelessWidget {
     this.selectedRoute,
   });
 
-  /// Décode une polyline Google encodée en liste de LatLng.
   List<LatLng> _decode(String encoded) {
-    if (encoded.isEmpty) return [];
-    try {
-      final result = <LatLng>[];
-      int index = 0, lat = 0, lng = 0;
-      final len = encoded.length;
-
-      while (index < len) {
-        int shift = 0, result0 = 0;
-        int b;
-        do {
-          b = encoded.codeUnitAt(index++) - 63;
-          result0 |= (b & 0x1f) << shift;
-          shift += 5;
-        } while (b >= 0x20);
-        final dlat = (result0 & 1) != 0 ? ~(result0 >> 1) : (result0 >> 1);
-        lat += dlat;
-
-        shift = 0;
-        result0 = 0;
-        do {
-          b = encoded.codeUnitAt(index++) - 63;
-          result0 |= (b & 0x1f) << shift;
-          shift += 5;
-        } while (b >= 0x20);
-        final dlng = (result0 & 1) != 0 ? ~(result0 >> 1) : (result0 >> 1);
-        lng += dlng;
-
-        result.add(LatLng(lat / 1e5, lng / 1e5));
-      }
-      return result;
-    } catch (e) {
-      return [];
-    }
+    return safeDecodePolyline(encoded);
   }
 
   LatLngBounds? _computeBounds(List<List<LatLng>> allPoints) {