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/wallet/payment_code_page.dart

@@ -73,18 +73,13 @@ class _PaymentCodePageState extends State<PaymentCodePage> {
         final state = await bloc.stream.firstWhere((s) => !s.isSubmitting);
         return state.failureOption.toNullable();
       },
+      onFailure: (f) => AppFlushbar.showError(context, walletFailureMessage(f)),
     );
   }
 
   @override
   Widget build(BuildContext context) {
-    return BlocConsumer<PaymentCodeFormBloc, PaymentCodeFormState>(
-      listenWhen: (p, c) => p.failureOption != c.failureOption,
-      listener: (context, state) => state.failureOption.fold(() {}, (f) {
-        if (!f.isPinError) {
-          AppFlushbar.showError(context, walletFailureMessage(f));
-        }
-      }),
+    return BlocBuilder<PaymentCodeFormBloc, PaymentCodeFormState>(
       builder: (context, state) {
         final code = state.paymentCode;