Fix tracing path and display issues

test/utils/log_rx_route_decoder_test.dart

@@ -116,6 +116,21 @@ void main() {
       expect(resolved.matchCount, 2);
     });
   });
+
+  group('LogRxRouteDecoder.reverseHopBytes', () {
+    test('reverses path by hop size', () {
+      final reversed = LogRxRouteDecoder.reverseHopBytes([
+        0xc2,
+        0xba,
+        0x5f,
+        0xde,
+        0xaa,
+        0xbb,
+      ], hashSize: 2);
+
+      expect(reversed, [0xaa, 0xbb, 0x5f, 0xde, 0xc2, 0xba]);
+    });
+  });
 }
 
 Contact _contact({required String name, required List<int> keyPrefix}) {

test/utils/trace_node_resolver_test.dart

@@ -0,0 +1,80 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:latlong2/latlong.dart';
+import 'package:meshcore_sar_app/services/mesh_map_nodes_service.dart';
+import 'package:meshcore_sar_app/utils/trace_node_resolver.dart';
+
+void main() {
+  test(
+    'prefers closest local repeater over online fallback for shared prefix',
+    () {
+      final localNear = _node(
+        name: 'Near Local',
+        publicKey: 'aa1100',
+        latitude: 46.05,
+        longitude: 14.50,
+      );
+      final localFar = _node(
+        name: 'Far Local',
+        publicKey: 'aa2200',
+        latitude: 46.40,
+        longitude: 14.90,
+      );
+      final online = _node(
+        name: 'Online',
+        publicKey: 'aa3300',
+        latitude: 46.06,
+        longitude: 14.51,
+      );
+
+      final resolved = TraceNodeResolver.resolveBest(
+        nodes: [localNear, localFar, online],
+        localPublicKeys: {localNear.publicKey, localFar.publicKey},
+        prefixHex: 'aa',
+        referenceA: const LatLng(46.0, 14.5),
+        referenceB: const LatLng(46.1, 14.5),
+      );
+
+      expect(resolved.node?.name, 'Near Local');
+      expect(resolved.usedOnlineFallback, isFalse);
+      expect(resolved.matchCount, 2);
+      expect(resolved.matchSummary, '2 local matches');
+    },
+  );
+
+  test('falls back to online node only when local match is missing', () {
+    final online = _node(
+      name: 'Online Only',
+      publicKey: 'bb1100',
+      latitude: 46.06,
+      longitude: 14.51,
+    );
+
+    final resolved = TraceNodeResolver.resolveBest(
+      nodes: [online],
+      localPublicKeys: const {},
+      prefixHex: 'bb',
+      referenceA: const LatLng(46.0, 14.5),
+      referenceB: const LatLng(46.1, 14.5),
+    );
+
+    expect(resolved.node?.name, 'Online Only');
+    expect(resolved.usedOnlineFallback, isTrue);
+    expect(resolved.matchCount, 1);
+  });
+}
+
+MeshMapNode _node({
+  required String name,
+  required String publicKey,
+  required double latitude,
+  required double longitude,
+}) {
+  return MeshMapNode(
+    type: 1,
+    name: name,
+    publicKey: publicKey,
+    latitude: latitude,
+    longitude: longitude,
+    updatedAtMs: 1,
+  );
+}