feat: Add statistics card on landing page

lib/features/landing/view/widgets/expansion_card.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+import 'package:paperless_mobile/extensions/flutter_extensions.dart';
+
+class ExpansionCard extends StatelessWidget {
+  final Widget title;
+  final Widget content;
+
+  const ExpansionCard({super.key, required this.title, required this.content});
+
+  @override
+  Widget build(BuildContext context) {
+    return Card(
+      margin: EdgeInsets.all(16),
+      child: Theme(
+        data: Theme.of(context).copyWith(
+          dividerColor: Colors.transparent,
+          expansionTileTheme: ExpansionTileThemeData(
+            shape: Theme.of(context).cardTheme.shape,
+            collapsedShape: Theme.of(context).cardTheme.shape,
+          ),
+          listTileTheme: ListTileThemeData(
+            shape: Theme.of(context).cardTheme.shape,
+          ),
+        ),
+        child: ExpansionTile(
+          initiallyExpanded: true,
+          title: title,
+          children: [content],
+        ),
+      ),
+    );
+  }
+}