feat: prepared screens

lib/ui/bal_page/widget/ongoing/bal_ongoing_screen.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/material.dart';
+import 'package:seshat/ui/bal_page/view_model/bal_view_model.dart';
+import 'package:seshat/ui/core/ui/navigation_bar.dart';
+
+class BalOngoingScreen extends StatelessWidget {
+  const BalOngoingScreen({super.key, required this.viewModel});
+
+  final BalViewModel viewModel;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      bottomNavigationBar: AppNavigationBar(startIndex: 0),
+      appBar: AppBar(title: Text(viewModel.bal!.name)),
+      body: Center(child: Text("Ongoing BAL")),
+    );
+  }
+}