chore: Initial commit

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XPovRHpejR4zRxuhjY4Qs3

lib/services/route_hash_preferences.dart

@@ -0,0 +1,34 @@
+import 'package:shared_preferences/shared_preferences.dart';
+import 'profiles_feature_service.dart';
+
+class RouteHashPreferences {
+  static const String _hashSizeKey = 'route_hash_size';
+  static const int defaultHashSize = 1;
+
+  static Future<int> getHashSize() async {
+    final prefs = await SharedPreferences.getInstance();
+    final value =
+        prefs.getInt(ProfileStorageScope.scopedKey(_hashSizeKey)) ??
+        defaultHashSize;
+    return _normalize(value);
+  }
+
+  static Future<void> setHashSize(int value) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setInt(
+      ProfileStorageScope.scopedKey(_hashSizeKey),
+      _normalize(value),
+    );
+  }
+
+  static int normalizeSync(int value) => _normalize(value);
+
+  /// Valid hash sizes per the MeshCore protocol.
+  /// The path encoding uses 2 bits: 00=1B, 01=2B, 10=3B, 11=4B.
+  static const List<int> supportedSizes = [1, 2, 3];
+
+  static int _normalize(int value) {
+    if (supportedSizes.contains(value)) return value;
+    return defaultHashSize;
+  }
+}