Introduce ChartTitle widget for consistent chart headings in EnergyConsumptionPerDeviceChartBox and TotalEnergyConsumptionChartBox

lib/pages/analytics/modules/energy_management/widgets/chart_title.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/material.dart';
+
+class ChartTitle extends StatelessWidget {
+  const ChartTitle({super.key, required this.title});
+
+  final Widget title;
+
+  @override
+  Widget build(BuildContext context) {
+    return DefaultTextStyle(
+      style: TextStyle(
+        fontSize: 22,
+        fontWeight: FontWeight.w700,
+      ),
+      child: title,
+    );
+  }
+}