Move "about osm" to about page, add option to clear tile caches, option to add reason when deleting, min zoom 16 for edits/submissions, 300km nav distance warning

lib/state/settings_state.dart

@@ -4,6 +4,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:collection/collection.dart';
 
 import '../models/tile_provider.dart';
+import '../services/provider_tile_cache_manager.dart';
 import '../dev_config.dart';
 import '../keys.dart';
 
@@ -332,6 +333,17 @@ class SettingsState extends ChangeNotifier {
     notifyListeners();
   }
 
+  /// Clear all tile caches for a specific provider
+  Future<void> clearTileProviderCaches(String providerId) async {
+    final provider = _tileProviders.firstWhereOrNull((p) => p.id == providerId);
+    if (provider == null) return;
+    
+    // Clear cache for each tile type in this provider
+    for (final tileType in provider.tileTypes) {
+      await ProviderTileCacheManager.deleteCache(providerId, tileType.id);
+    }
+  }
+
   /// Set follow-me mode
   Future<void> setFollowMeMode(FollowMeMode mode) async {
     if (_followMeMode != mode) {

lib/state/upload_queue_state.dart

@@ -253,12 +253,12 @@ class UploadQueueState extends ChangeNotifier {
   }
 
   // Add a node deletion to the upload queue
-  void addFromNodeDeletion(OsmNode node, {required UploadMode uploadMode}) {
+  void addFromNodeDeletion(OsmNode node, {required UploadMode uploadMode, String? changesetComment}) {
     final upload = PendingUpload(
       coord: node.coord,
       direction: node.directionDeg.isNotEmpty ? node.directionDeg.first : 0, // Direction not used for deletions but required for API
       profile: null, // No profile needed for deletions - just delete by node ID
-      changesetComment: 'Delete a surveillance node', // Default comment for deletions  
+      changesetComment: changesetComment ?? 'Delete a surveillance node', // Use provided comment or default
       uploadMode: uploadMode,
       operation: UploadOperation.delete,
       originalNodeId: node.id,