refactor(neon,neon_files,neon_news,neon_notes,neon_notifications): make AppImplementation immutable and cleanup options initialization

Signed-off-by: Nikolas Rimikis <rimikis.nikolas@gmail.com>

packages/neon/neon/lib/src/models/app_implementation.dart

@@ -2,6 +2,7 @@ import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 import 'package:go_router/go_router.dart';
+import 'package:meta/meta.dart';
 import 'package:neon/l10n/localizations.dart';
 import 'package:neon/src/bloc/bloc.dart';
 import 'package:neon/src/blocs/accounts.dart';
@@ -12,11 +13,9 @@ import 'package:neon/src/widgets/drawer_destination.dart';
 import 'package:provider/provider.dart';
 import 'package:rxdart/rxdart.dart';
 
+@immutable
 abstract class AppImplementation<T extends Bloc, R extends NextcloudAppOptions> {
-  AppImplementation() {
-    final storage = AppStorage('app-$id');
-    options = buildOptions(storage);
-  }
+  AppImplementation();
 
   String get id;
   LocalizationsDelegate get localizationsDelegate;
@@ -25,10 +24,11 @@ abstract class AppImplementation<T extends Bloc, R extends NextcloudAppOptions>
   String nameFromLocalization(final AppLocalizations localizations) => localizations.appImplementationName(id);
   String name(final BuildContext context) => nameFromLocalization(AppLocalizations.of(context));
 
-  late final R options;
-
   @protected
-  R buildOptions(final AppStorage storage);
+  late final AppStorage storage = AppStorage('app-$id');
+
+  @mustBeOverridden
+  R get options;
 
   final Map<String, T> _blocs = {};
 
@@ -115,7 +115,7 @@ abstract class AppImplementation<T extends Bloc, R extends NextcloudAppOptions>
   /// A custom theme that will be injected into the widget tree.
   ///
   /// You can later acess it through `Theme.of(context).extension<ThemeName>()`.
-  ThemeExtension? theme;
+  final ThemeExtension? theme = null;
 }
 
 extension AppImplementationFind on Iterable<AppImplementation> {

packages/neon/neon/lib/src/models/notifications_interface.dart

@@ -1,3 +1,4 @@
+import 'package:meta/meta.dart';
 import 'package:neon/src/bloc/bloc.dart';
 import 'package:neon/src/models/app_implementation.dart';
 import 'package:neon/src/settings/models/nextcloud_app_options.dart';
@@ -5,6 +6,10 @@ import 'package:neon/src/settings/models/nextcloud_app_options.dart';
 abstract interface class NotificationsAppInterface<T extends NotificationsBlocInterface,
     R extends NotificationsOptionsInterface> extends AppImplementation<T, R> {
   NotificationsAppInterface();
+
+  @override
+  @mustBeOverridden
+  R get options => throw UnimplementedError();
 }
 
 abstract interface class NotificationsBlocInterface extends InteractiveBloc {

packages/neon/neon_files/lib/neon_files.dart

@@ -56,7 +56,7 @@ class FilesApp extends AppImplementation<FilesBloc, FilesAppSpecificOptions> {
   List<Locale> supportedLocales = AppLocalizations.supportedLocales;
 
   @override
-  FilesAppSpecificOptions buildOptions(final AppStorage storage) => FilesAppSpecificOptions(storage);
+  late final FilesAppSpecificOptions options = FilesAppSpecificOptions(storage);
 
   @override
   FilesBloc buildBloc(final Account account) => FilesBloc(

packages/neon/neon_news/lib/neon_news.dart

@@ -64,7 +64,7 @@ class NewsApp extends AppImplementation<NewsBloc, NewsAppSpecificOptions> {
   List<Locale> supportedLocales = AppLocalizations.supportedLocales;
 
   @override
-  NewsAppSpecificOptions buildOptions(final AppStorage storage) => NewsAppSpecificOptions(storage);
+  late final NewsAppSpecificOptions options = NewsAppSpecificOptions(storage);
 
   @override
   NewsBloc buildBloc(final Account account) => NewsBloc(

packages/neon/neon_notes/lib/neon_notes.dart

@@ -54,7 +54,7 @@ class NotesApp extends AppImplementation<NotesBloc, NotesAppSpecificOptions> {
   LocalizationsDelegate localizationsDelegate = AppLocalizations.delegate;
 
   @override
-  NotesAppSpecificOptions buildOptions(final AppStorage storage) => NotesAppSpecificOptions(storage);
+  late final NotesAppSpecificOptions options = NotesAppSpecificOptions(storage);
 
   @override
   NotesBloc buildBloc(final Account account) => NotesBloc(

packages/neon/neon_notifications/lib/neon_notifications.dart

@@ -34,7 +34,7 @@ class NotificationsApp extends AppImplementation<NotificationsBloc, Notification
   List<Locale> supportedLocales = AppLocalizations.supportedLocales;
 
   @override
-  NotificationsAppSpecificOptions buildOptions(final AppStorage storage) => NotificationsAppSpecificOptions(storage);
+  late final NotificationsAppSpecificOptions options = NotificationsAppSpecificOptions(storage);
 
   @override
   NotificationsBloc buildBloc(final Account account) => NotificationsBloc(