feat: Add Mapy.cz Outdoor (OSM + LIDAR) base map layer

- New MapLayerType.mapyOutdoor with Referer header support
  (tile server rejects requests without mapy.com Referer)
- Headered layers get a dedicated NetworkTileProvider sharing
  the offline tile cache
- Offline region downloads pass layer headers through
  TileDownloadService

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/models/map_layer.dart

@@ -12,6 +12,8 @@ enum MapLayerType {
   // Kept for stored preference compatibility after MBTiles removal.
   vectorMbtiles,
   wmsBase,
+  // Appended last: stored layer preference is the enum index.
+  mapyOutdoor,
 }
 
 class MapLayer {
@@ -21,6 +23,9 @@ class MapLayer {
   final String attribution;
   final double maxZoom;
 
+  /// Extra HTTP headers required by the tile server (e.g. Referer).
+  final Map<String, String>? headers;
+
   // WMS specific properties
   final bool isWms;
   final String? wmsBaseUrl;
@@ -36,6 +41,7 @@ class MapLayer {
     required this.urlTemplate,
     required this.attribution,
     required this.maxZoom,
+    this.headers,
     this.isWms = false,
     this.wmsBaseUrl,
     this.wmsLayers,
@@ -64,6 +70,9 @@ class MapLayer {
       case MapLayerType.vectorMbtiles:
         // Legacy value kept only for preference migration compatibility.
         return name;
+      case MapLayerType.mapyOutdoor:
+        // Brand name, not translated.
+        return name;
       case MapLayerType.wmsBase:
         // For WMS layers, use the name (will be localized separately)
         return name;
@@ -86,6 +95,17 @@ class MapLayer {
     maxZoom: 17.49, // OpenTopoMap maximum (just below level 18)
   );
 
+  /// Mapy.cz outdoor map: OSM data with LIDAR-based shaded relief.
+  /// The tile server rejects requests without a mapy.com Referer.
+  static const mapyOutdoor = MapLayer(
+    type: MapLayerType.mapyOutdoor,
+    name: 'Mapy.cz Outdoor (OSM + LIDAR)',
+    urlTemplate: 'https://mapserver.mapy.cz/turist-en/retina/{z}-{x}-{y}',
+    attribution: '© Seznam.cz, a.s., © OpenStreetMap contributors',
+    maxZoom: 19,
+    headers: {'Referer': 'https://mapy.com/'},
+  );
+
   static const esriWorldImagery = MapLayer(
     type: MapLayerType.esriWorldImagery,
     name: 'ESRI Satellite',
@@ -160,6 +180,7 @@ class MapLayer {
   static const List<MapLayer> allLayers = [
     openStreetMap,
     openTopoMap,
+    mapyOutdoor,
     esriWorldImagery,
     googleHybrid,
     googleRoadmap,

lib/providers/offline_tiles_provider.dart

@@ -266,6 +266,7 @@ class OfflineTilesProvider extends ChangeNotifier {
       maxZoom: _maxZoom,
       urlTemplate: _selectedLayer.urlTemplate,
       displayName: _selectedLayer.name,
+      headers: _selectedLayer.headers,
     );
 
     await for (final event in stream) {

lib/screens/map_tab.dart

@@ -63,14 +63,31 @@ class MapTab extends StatefulWidget {
 
 class _MapTabState extends State<MapTab> with AutomaticKeepAliveClientMixin {
   final MapController _mapController = MapController();
+  static final MapCachingProvider _tileCachingProvider =
+      OfflineMapCachingProvider(
+        BuiltInMapCachingProvider.getOrCreateInstance(
+          maxCacheSize: 10_000_000_000,
+          overrideFreshAge: const Duration(days: 365),
+        ),
+      );
   static final TileProvider _tileProvider = NetworkTileProvider(
-    cachingProvider: OfflineMapCachingProvider(
+    cachingProvider: _tileCachingProvider,
-      BuiltInMapCachingProvider.getOrCreateInstance(
-        maxCacheSize: 10_000_000_000,
-        overrideFreshAge: const Duration(days: 365),
-      ),
-    ),
   );
+  // Providers for layers that need extra HTTP headers (e.g. Mapy.cz Referer),
+  // cached per URL template so they are not recreated on every build.
+  static final Map<String, TileProvider> _headeredTileProviders = {};
+
+  static TileProvider _tileProviderFor(MapLayer layer) {
+    final headers = layer.headers;
+    if (headers == null) return _tileProvider;
+    return _headeredTileProviders.putIfAbsent(
+      layer.urlTemplate,
+      () => NetworkTileProvider(
+        headers: headers,
+        cachingProvider: _tileCachingProvider,
+      ),
+    );
+  }
   // DO NOT create a new LocationTrackingService instance here
   // Use the singleton from AppProvider instead via _locationService getter
   final MapMarkerService _markerService = MapMarkerService();
@@ -2974,7 +2991,7 @@ class _MapTabState extends State<MapTab> with AutomaticKeepAliveClientMixin {
                   else if (!_currentLayer.isWms)
                     flutter_map.TileLayer(
                       urlTemplate: _currentLayer.urlTemplate,
-                      tileProvider: _tileProvider,
+                      tileProvider: _tileProviderFor(_currentLayer),
                       userAgentPackageName: 'com.meshcore.sar',
                       maxZoom: _currentLayer.maxZoom,
                     ),

lib/screens/offline_map_screen.dart

@@ -114,6 +114,9 @@ class _OfflineMapScreenState extends State<OfflineMapScreen> {
                 children: [
                   TileLayer(
                     urlTemplate: provider.selectedLayer.urlTemplate,
+                    tileProvider: NetworkTileProvider(
+                      headers: provider.selectedLayer.headers ?? const {},
+                    ),
                     userAgentPackageName: 'com.meshcore.sar',
                     maxZoom: provider.selectedLayer.maxZoom,
                   ),

lib/services/tile_download_service.dart

@@ -84,6 +84,7 @@ class TileDownloadService {
     required int maxZoom,
     required String urlTemplate,
     String? displayName,
+    Map<String, String>? headers,
     int maxConcurrency = 6,
     int rateLimit = 30,
   }) {
@@ -96,6 +97,7 @@ class TileDownloadService {
       maxZoom: maxZoom,
       urlTemplate: urlTemplate,
       displayName: displayName,
+      headers: headers,
       maxConcurrency: maxConcurrency,
       rateLimit: rateLimit,
     );
@@ -110,6 +112,7 @@ class TileDownloadService {
     required int maxZoom,
     required String urlTemplate,
     String? displayName,
+    Map<String, String>? headers,
     required int maxConcurrency,
     required int rateLimit,
   }) async {
@@ -184,7 +187,7 @@ class TileDownloadService {
         break;
       }
 
-      final future = _downloadSingleTile(tile, urlTemplate, styleHash)
+      final future = _downloadSingleTile(tile, urlTemplate, styleHash, headers)
           .then((event) {
         if (!controller.isClosed) {
           controller.add(event);
@@ -220,6 +223,7 @@ class TileDownloadService {
     TileCoord tile,
     String urlTemplate,
     String styleHash,
+    Map<String, String>? extraHeaders,
   ) async {
     final bounds = TileMathService.tileBounds(tile.x, tile.y, tile.z);
 
@@ -241,7 +245,7 @@ class TileDownloadService {
       try {
         final response = await _httpClient.get(
           Uri.parse(url),
-          headers: {'User-Agent': 'MeshCoreSAR/1.0'},
+          headers: {'User-Agent': 'MeshCoreSAR/1.0', ...?extraHeaders},
         );
 
         if (response.statusCode != 200) {