Flutter code restructuring

pi/ui/lib/widgets/stat_box.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/material.dart';
+
+/// A labeled stat display box for the dashboard
+class StatBox extends StatelessWidget {
+  final String label;
+  final String value;
+
+  const StatBox({super.key, required this.label, required this.value});
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        Text(
+          value,
+          style: Theme.of(context).textTheme.headlineMedium?.copyWith(
+            color: Colors.white,
+          ),
+        ),
+        Text(
+          label,
+          style: Theme.of(context).textTheme.bodySmall?.copyWith(
+            color: Colors.grey,
+            letterSpacing: 1,
+          ),
+        ),
+      ],
+    );
+  }
+}