adding packages

packages/pocketbase_auth/lib/src/persistent_auth_store.dart

@@ -0,0 +1,42 @@
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:pocketbase/pocketbase.dart';
+
+/// Abstract contract for authentication persistence.
+/// Implement this to use different storage solutions (e.g., Hive, SecureStorage).
+abstract class AuthPersistence {
+  Future<void> saveAuthData(String data);
+  Future<String?> loadAuthData();
+  Future<void> clearAuthData();
+}
+
+/// SharedPreferences implementation of [AuthPersistence].
+class SharedPrefsAuthPersistence implements AuthPersistence {
+  final SharedPreferences _prefs;
+  static const String _kAuthKey = 'pb_auth_token';
+
+  SharedPrefsAuthPersistence(this._prefs);
+
+  @override
+  Future<void> saveAuthData(String data) async {
+    await _prefs.setString(_kAuthKey, data);
+  }
+
+  @override
+  Future<String?> loadAuthData() async {
+    return _prefs.getString(_kAuthKey);
+  }
+
+  @override
+  Future<void> clearAuthData() async {
+    await _prefs.remove(_kAuthKey);
+  }
+}
+
+/// The custom AuthStore that connects PocketBase to any [AuthPersistence] implementation.
+class PersistentAuthStore extends AsyncAuthStore {
+  PersistentAuthStore({required AuthPersistence persistence, super.initial})
+    : super(
+        save: (String data) => persistence.saveAuthData(data),
+        clear: () => persistence.clearAuthData(),
+      );
+}