initial commit

lib/core/utils/shared_preferences_provider.dart

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+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+/// Overridden in `main()` with an instance obtained via
+/// `SharedPreferences.getInstance()` before `runApp`. Left unimplemented by
+/// default so a missing override fails loudly instead of silently using a
+/// throwaway in-memory instance.
+final sharedPreferencesProvider = Provider<SharedPreferences>((ref) {
+  throw UnimplementedError(
+    'sharedPreferencesProvider must be overridden in main() with a loaded SharedPreferences instance.',
+  );
+});