fix: reorganize main and navigation

lib/ui/views/navigation/navigation_view.dart

@@ -0,0 +1,64 @@
+import 'package:animations/animations.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_i18n/flutter_i18n.dart';
+import 'package:revanced_manager/app/app.locator.dart';
+import 'package:revanced_manager/ui/views/navigation/navigation_viewmodel.dart';
+import 'package:stacked/stacked.dart';
+
+class NavigationView extends StatelessWidget {
+  const NavigationView({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return ViewModelBuilder<NavigationViewModel>.reactive(
+      viewModelBuilder: () => locator<NavigationViewModel>(),
+      builder: (context, model, child) => Scaffold(
+        body: PageTransitionSwitcher(
+          duration: const Duration(milliseconds: 400),
+          transitionBuilder: (
+            Widget child,
+            Animation<double> animation,
+            Animation<double> secondaryAnimation,
+          ) {
+            return FadeThroughTransition(
+              animation: animation,
+              secondaryAnimation: secondaryAnimation,
+              fillColor: Theme.of(context).colorScheme.surface,
+              child: child,
+            );
+          },
+          child: model.getViewForIndex(model.currentIndex),
+        ),
+        bottomNavigationBar: NavigationBar(
+          onDestinationSelected: model.setIndex,
+          selectedIndex: model.currentIndex,
+          destinations: <Widget>[
+            NavigationDestination(
+              icon: const Icon(
+                Icons.dashboard,
+              ),
+              label: FlutterI18n.translate(
+                context,
+                'main.dashboardTab',
+              ),
+            ),
+            NavigationDestination(
+              icon: const Icon(Icons.build),
+              label: FlutterI18n.translate(
+                context,
+                'main.patcherTab',
+              ),
+            ),
+            NavigationDestination(
+              icon: const Icon(Icons.settings),
+              label: FlutterI18n.translate(
+                context,
+                'main.settingsTab',
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/ui/views/navigation/navigation_viewmodel.dart

@@ -0,0 +1,22 @@
+import 'package:flutter/material.dart';
+import 'package:injectable/injectable.dart';
+import 'package:revanced_manager/ui/views/home/home_view.dart';
+import 'package:revanced_manager/ui/views/patcher/patcher_view.dart';
+import 'package:revanced_manager/ui/views/settings/settings_view.dart';
+import 'package:stacked/stacked.dart';
+
+@lazySingleton
+class NavigationViewModel extends IndexTrackingViewModel {
+  Widget getViewForIndex(int index) {
+    switch (index) {
+      case 0:
+        return const HomeView();
+      case 1:
+        return const PatcherView();
+      case 2:
+        return SettingsView();
+      default:
+        return const HomeView();
+    }
+  }
+}