feat: bugfixes, finished go_router migration, implemented better visibility of states

lib/features/login/view/widgets/login_transition_page.dart

@@ -0,0 +1,34 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:paperless_mobile/extensions/flutter_extensions.dart';
+import 'package:paperless_mobile/theme.dart';
+
+class LoginTransitionPage extends StatelessWidget {
+  final String text;
+  const LoginTransitionPage({super.key, required this.text});
+
+  @override
+  Widget build(BuildContext context) {
+    return WillPopScope(
+      onWillPop: () async => false,
+      child: AnnotatedRegion<SystemUiOverlayStyle>(
+        value: buildOverlayStyle(
+          Theme.of(context),
+          systemNavigationBarColor: Theme.of(context).colorScheme.background,
+        ),
+        child: Scaffold(
+          body: Stack(
+            alignment: Alignment.center,
+            children: [
+              const CircularProgressIndicator(),
+              Align(
+                alignment: Alignment.bottomCenter,
+                child: Text(text).paddedOnly(bottom: 24),
+              ),
+            ],
+          ).padded(16),
+        ),
+      ),
+    );
+  }
+}