Added missing widget

lib/ui/screens/sandbox.dart

 import 'package:flutter_neumorphic/flutter_neumorphic.dart';
 
-import '../widgets/first_screen/card_name_editable.dart';
+import '../widgets/first_screen/credit_card.dart';
 
 class Sandbox extends StatefulWidget {
   const Sandbox({super.key});
@@ -10,12 +10,68 @@ class Sandbox extends StatefulWidget {
 }
 
 class _SandboxState extends State<Sandbox> {
+  final double expandedHeight = 500;
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-        appBar: AppBar(
-          title: const Text('Sandbox'),
-        ),
-        body: const CardNameEditable());
+      body: CustomScrollView(
+        slivers: <Widget>[
+          SliverAppBar(
+            expandedHeight: expandedHeight,
+            pinned: true,
+            flexibleSpace: LayoutBuilder(
+                builder: (BuildContext context, BoxConstraints constraints) {
+              // Calcula la proporción de la altura actual respecto a la altura expandida
+              final double percent =
+                  (expandedHeight - constraints.maxHeight) / expandedHeight;
+
+              return Stack(
+                fit: StackFit.expand,
+                children: <Widget>[
+                  // CreditCard(),
+                  Positioned(
+                    top: 0,
+                    left: 0,
+                    child: ClipRect(
+                      child: AnimatedOpacity(
+                        opacity: 1 - percent,
+                        duration: const Duration(milliseconds: 200),
+                        child: CreditCard(),
+                      ),
+                    ),
+                  ),
+                  Positioned(
+                    bottom: 16,
+                    left: 36,
+                    child: ClipRect(
+                      child: AnimatedOpacity(
+                        opacity: percent,
+                        duration: const Duration(milliseconds: 200),
+                        child: Text(
+                          'Mi AppBar',
+                          style: Theme.of(context)
+                              .textTheme
+                              .headlineSmall
+                              ?.copyWith(color: Colors.white),
+                        ),
+                      ),
+                    ),
+                  ),
+                ],
+              );
+            }),
+          ),
+          SliverList(
+            delegate: SliverChildBuilderDelegate(
+              (BuildContext context, int index) => ListTile(
+                title: Text('Item $index'),
+              ),
+              childCount: 50,
+            ),
+          ),
+        ],
+      ),
+    );
   }
 }

lib/ui/widgets/fifth_screen/import_clipboard_dialog.dart

+import 'package:clipboard/clipboard.dart';
+import 'package:easy_localization/easy_localization.dart';
+import 'package:flutter/material.dart';
+
+class ImportClipboardDialog extends StatefulWidget {
+  const ImportClipboardDialog({super.key, required this.onImport});
+
+  final Function(String) onImport;
+
+  @override
+  State<ImportClipboardDialog> createState() => _ImportClipboardDialogState();
+}
+
+class _ImportClipboardDialogState extends State<ImportClipboardDialog> {
+  final TextEditingController _textController = TextEditingController();
+
+  Future<void> _pasteFromClipboard() async {
+    FlutterClipboard.paste().then((String? value) {
+      setState(() {
+        if (value != null) {
+          _textController.text = value;
+        }
+      });
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Text(tr('import_wallet_from_clipboard')),
+      content: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: <Widget>[
+          Text(tr('import_wallet_from_clipboard_desc')),
+          TextField(
+            controller: _textController,
+            maxLines: 5,
+            decoration: InputDecoration(hintText: tr('paste_here')),
+          ),
+          const SizedBox(height: 10),
+          TextButton(
+            onPressed: _pasteFromClipboard,
+            child: Text(tr('paste')),
+          ),
+        ],
+      ),
+      actions: <Widget>[
+        TextButton(
+          child: Text(tr('import')),
+          onPressed: () {
+            Navigator.of(context).pop(_textController.text);
+            widget.onImport(_textController.text);
+          },
+        ),
+      ],
+    );
+  }
+}