feat: prepared screens

lib/ui/bal_page/widget/bal_page.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:seshat/domain/models/bal.dart';
 import 'package:seshat/ui/bal_page/view_model/bal_view_model.dart';
+import 'package:seshat/ui/bal_page/widget/ended/bal_ended_screen.dart';
+import 'package:seshat/ui/bal_page/widget/ongoing/bal_ongoing_screen.dart';
 import 'package:seshat/ui/bal_page/widget/pending/bal_pending_screen.dart';
 import 'package:seshat/ui/core/ui/navigation_bar.dart';
 import 'package:seshat/ui/core/ui/await_loading.dart';
@@ -34,8 +36,8 @@ class _BalPageState extends State<BalPage> {
             ),
             false => switch (widget.viewModel.bal!.state) {
               BalState.pending => BalPendingScreen(viewModel: widget.viewModel),
-              BalState.ongoing => Center(child: Text("Ongoing")),
+              BalState.ongoing => BalOngoingScreen(viewModel: widget.viewModel),
-              BalState.ended => Center(child: Text("Ending")),
+              BalState.ended => BalEndedScreen(viewModel: widget.viewModel),
             },
           },
         };

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")),
+    );
+  }
+}