"existing tags" temp profile when editing, "existing operator" profile when such tags exist, full editing of existing nodes via refine tags

lib/models/operator_profile.dart

@@ -1,4 +1,5 @@
 import 'package:uuid/uuid.dart';
+import 'osm_node.dart';
 
 /// A bundle of OSM tags that describe a particular surveillance operator.
 /// These are applied on top of camera profile tags during submissions.
@@ -76,4 +77,56 @@ class OperatorProfile {
 
   @override
   int get hashCode => id.hashCode;
+
+  /// Create a temporary operator profile from existing operator tags on a node
+  /// First tries to match against saved operator profiles, otherwise creates temporary one
+  /// Used as the default operator profile when editing nodes
+  static OperatorProfile? createExistingOperatorProfile(OsmNode node, List<OperatorProfile> savedProfiles) {
+    final operatorTags = _extractOperatorTags(node.tags);
+    if (operatorTags.isEmpty) return null;
+    
+    // First, try to find a perfect match among saved profiles
+    for (final savedProfile in savedProfiles) {
+      if (_tagsMatch(savedProfile.tags, operatorTags)) {
+        return savedProfile;
+      }
+    }
+    
+    // No perfect match found, create temporary profile
+    final operatorName = operatorTags['operator'] ?? '<existing>';
+    
+    return OperatorProfile(
+      id: 'temp-existing-operator-${node.id}',
+      name: operatorName,
+      tags: operatorTags,
+    );
+  }
+
+  /// Check if two tag maps are identical
+  static bool _tagsMatch(Map<String, String> tags1, Map<String, String> tags2) {
+    if (tags1.length != tags2.length) return false;
+    
+    for (final entry in tags1.entries) {
+      if (tags2[entry.key] != entry.value) return false;
+    }
+    
+    return true;
+  }
+
+  /// Extract all operator-related tags from a node's tags
+  static Map<String, String> _extractOperatorTags(Map<String, String> tags) {
+    final operatorTags = <String, String>{};
+    
+    for (final entry in tags.entries) {
+      // Include operator= and any operator:*= tags
+      if (entry.key == 'operator' || entry.key.startsWith('operator:')) {
+        operatorTags[entry.key] = entry.value;
+      }
+    }
+    
+    return operatorTags;
+  }
+
+  /// Returns true if this is a temporary "existing operator" profile
+  bool get isExistingOperatorProfile => id.startsWith('temp-existing-operator-');
 }