Tab Community, tombol Bayar di navbar, logo placeholder, fix crash PIN

- Bottom navbar: Home, Pesanan, Bayar (tombol tengah ke kode bayar),
  Community, Profil; menu EnakCommunity di beranda pindah ke tab
- Image placeholder: logo Enaklo diperbesar, ilustrasi gelas dihapus
- Fix assertion Navigator saat PIN gagal karena error non-PIN: flushbar
  kini tampil lewat onFailure setelah sheet PIN tertutup (bayar, tukar,
  transfer)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/presentation/pages/pin/widgets/pin_sheet.dart

@@ -14,14 +14,21 @@ typedef PinSubmitCallback = Future<WalletFailure?> Function(String pin);
 enum _PinSheetResult { success, failed, forgotPin, pinNotSet }
 
 /// Meminta PIN lalu menjalankan [onSubmit]. Error PIN (§6.5) ditangani di dalam
-/// sheet; failure lain menutup sheet dan ditampilkan oleh halaman pemanggil.
+/// sheet; failure lain menutup sheet lalu diteruskan ke [onFailure].
 /// Mengembalikan `true` bila [onSubmit] sukses.
+///
+/// Tampilkan failure lewat [onFailure], jangan dari listener bloc: flushbar juga
+/// berupa route, jadi bila muncul selagi sheet masih terbuka, pop milik sheet
+/// justru menutup flushbar dan Navigator gagal assertion.
 Future<bool> showPinSheet(
   BuildContext context, {
   required String title,
   String? subtitle,
   required PinSubmitCallback onSubmit,
+  ValueChanged<WalletFailure>? onFailure,
 }) async {
+  WalletFailure? lastFailure;
+
   final result = await showModalBottomSheet<_PinSheetResult>(
     context: context,
     isScrollControlled: true,
@@ -30,8 +37,11 @@ Future<bool> showPinSheet(
     shape: const RoundedRectangleBorder(
       borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
     ),
-    builder: (_) =>
-        _PinSheet(title: title, subtitle: subtitle, onSubmit: onSubmit),
+    builder: (_) => _PinSheet(
+      title: title,
+      subtitle: subtitle,
+      onSubmit: (pin) async => lastFailure = await onSubmit(pin),
+    ),
   );
 
   if (!context.mounted) return false;
@@ -46,6 +56,8 @@ Future<bool> showPinSheet(
       context.router.push(PinSetupRoute(purpose: PinOtpPurpose.setup));
       return false;
     case _PinSheetResult.failed:
+      if (lastFailure != null) onFailure?.call(lastFailure!);
+      return false;
     case null:
       return false;
   }