feat(proj): init

mobile/widgetbook/lib/addons/device_frame_addon.dart

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+import 'package:widgetbook/widgetbook.dart';
+
+/// Common phone frames for visual QA (ViewportAddon replaces DeviceFrameAddon).
+ViewportAddon buildDeviceFrameAddon() {
+  return ViewportAddon([
+    Viewports.none,
+    IosViewports.iPhone13,
+    IosViewports.iPhone13Mini,
+    AndroidViewports.samsungGalaxyS20,
+  ]);
+}

mobile/widgetbook/lib/addons/locale_addon.dart

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+import 'package:flutter/widgets.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:widgetbook/widgetbook.dart';
+
+/// Locale switcher: Russian / English.
+LocalizationAddon buildLocaleAddon() {
+  return LocalizationAddon(
+    locales: const [
+      Locale('ru'),
+      Locale('en'),
+    ],
+    localizationsDelegates: const [
+      GlobalMaterialLocalizations.delegate,
+      GlobalWidgetsLocalizations.delegate,
+      GlobalCupertinoLocalizations.delegate,
+    ],
+    initialLocale: const Locale('ru'),
+  );
+}

mobile/widgetbook/lib/addons/theme_addon.dart

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+import 'package:please_pay_me/theme/theme.dart';
+import 'package:widgetbook/widgetbook.dart';
+
+/// Light / dark Cupertino theme built from the shared product tokens.
+CupertinoThemeAddon buildThemeAddon() {
+  return CupertinoThemeAddon(
+    themes: [
+      WidgetbookTheme(name: 'Light', data: buildLightTheme()),
+      WidgetbookTheme(name: 'Dark', data: buildDarkTheme()),
+    ],
+  );
+}