Refactor provider initialization to load only essential providers at startup. Introduce TabNavigationService for managing tab state and update screens to respond to tab changes. Clean up view models and navigation logic for improved performance and maintainability.

lib/core/providers/tenders_provider.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+import '../../data/repositories/tenders_repository.dart';
+import '../../view_models/tenders_view_model.dart';
+
+/// Lazy TendersViewModel provider
+/// Wraps screens that need TendersViewModel
+Widget tendersProvider({required Widget child}) {
+  return ChangeNotifierProvider(
+    create:
+        (context) => TendersViewModel(
+          tendersRepository: context.read<TendersRepository>(),
+        ),
+    child: child,
+  );
+}