refactor: Enable more strict lints

lib/utils/background_push.dart

@@ -72,7 +72,7 @@ class BackgroundPush {
 
   bool upAction = false;
 
-  void _init() async {
+  Future<void> _init() async {
     //<GOOGLE_SERVICES>firebaseEnabled = true;
     try {
       mainIsolateReceivePort?.listen((message) async {

lib/utils/client_download_content_extension.dart

@@ -22,7 +22,7 @@ extension ClientDownloadContentExtension on Client {
             width: width,
             height: height,
             animated: animated,
-            method: thumbnailMethod!,
+            method: thumbnailMethod,
           )
         : mxc;
 

lib/utils/client_manager.dart

@@ -145,7 +145,7 @@ abstract class ClientManager {
     );
   }
 
-  static void sendInitNotification(String title, String body) async {
+  static Future<void> sendInitNotification(String title, String body) async {
     if (kIsWeb) {
       html.Notification(title, body: body);
       return;

lib/utils/error_reporter.dart

@@ -22,14 +22,14 @@ class ErrorReporter {
     'HandshakeException',
   };
 
-  void onErrorCallback(Object error, [StackTrace? stackTrace]) {
+  Future<void> onErrorCallback(Object error, [StackTrace? stackTrace]) async {
     if (ingoredTypes.contains(error.runtimeType.toString())) return;
     Logs().e(message ?? 'Error caught', error, stackTrace);
     final text = '$error\n${stackTrace ?? ''}';
     return _onErrorCallback(text);
   }
 
-  void _onErrorCallback(String text) async {
+  Future<void> _onErrorCallback(String text) async {
     await showAdaptiveDialog(
       context: context!,
       builder: (context) => AlertDialog.adaptive(

lib/utils/markdown_context_builder.dart

@@ -56,7 +56,7 @@ class MarkdownContextBuilder extends StatelessWidget {
               controller.text = controller.text.replaceRange(
                 selection.start,
                 selection.end,
-                '[$selectedText](${url.toString()})',
+                '[$selectedText]($url)',
               );
               ContextMenuController.removeAny();
             },

lib/utils/matrix_sdk_extensions/event_extension.dart

@@ -26,13 +26,13 @@ extension LocalizedBody on Event {
         },
       );
 
-  void saveFile(BuildContext context) async {
+  Future<void> saveFile(BuildContext context) async {
     final matrixFile = await _getFile(context);
 
     matrixFile.result?.save(context);
   }
 
-  void shareFile(BuildContext context) async {
+  Future<void> shareFile(BuildContext context) async {
     final matrixFile = await _getFile(context);
     inspect(matrixFile);
 

lib/utils/matrix_sdk_extensions/flutter_matrix_dart_sdk_database/cipher.dart

@@ -47,7 +47,7 @@ Future<String?> getDatabaseCipher() async {
   return password;
 }
 
-void _sendNoEncryptionWarning(Object exception) async {
+Future<void> _sendNoEncryptionWarning(Object exception) async {
   final isStored = AppSettings.noEncryptionWarningShown.value;
 
   if (isStored == true) return;

lib/utils/matrix_sdk_extensions/matrix_file_extension.dart

@@ -8,7 +8,7 @@ import 'package:fluffychat/l10n/l10n.dart';
 import 'package:fluffychat/utils/size_string.dart';
 
 extension MatrixFileExtension on MatrixFile {
-  void save(BuildContext context) async {
+  Future<void> save(BuildContext context) async {
     final scaffoldMessenger = ScaffoldMessenger.of(context);
     final l10n = L10n.of(context);
     final downloadPath = await FilePicker.platform.saveFile(
@@ -31,7 +31,7 @@ extension MatrixFileExtension on MatrixFile {
     return FileType.any;
   }
 
-  void share(BuildContext context) async {
+  Future<void> share(BuildContext context) async {
     // Workaround for iPad from
     // https://github.com/fluttercommunity/plus_plugins/tree/main/packages/share_plus/share_plus#ipad
     final box = context.findRenderObject() as RenderBox?;

lib/utils/notification_background_handler.dart

@@ -53,7 +53,7 @@ Future<void> waitForPushIsolateDone() async {
 }
 
 @pragma('vm:entry-point')
-void notificationTapBackground(
+Future<void> notificationTapBackground(
   NotificationResponse notificationResponse,
 ) async {
   final sendPort = IsolateNameServer.lookupPortByName(

lib/utils/platform_infos.dart

@@ -47,7 +47,7 @@ abstract class PlatformInfos {
     return version;
   }
 
-  static void showDialog(BuildContext context) async {
+  static Future<void> showDialog(BuildContext context) async {
     final version = await PlatformInfos.getVersion();
     showAboutDialog(
       context: context,

lib/utils/show_update_snackbar.dart

@@ -10,7 +10,7 @@ import 'package:fluffychat/utils/platform_infos.dart';
 abstract class UpdateNotifier {
   static const String versionStoreKey = 'last_known_version';
 
-  static void showUpdateSnackBar(BuildContext context) async {
+  static Future<void> showUpdateSnackBar(BuildContext context) async {
     final scaffoldMessenger = ScaffoldMessenger.of(context);
     final currentVersion = await PlatformInfos.getVersion();
     final store = await SharedPreferences.getInstance();

lib/utils/sign_in_flows/check_homeserver.dart

@@ -13,7 +13,7 @@ import 'package:fluffychat/utils/sign_in_flows/sso_login.dart';
 import 'package:fluffychat/widgets/adaptive_dialogs/show_ok_cancel_alert_dialog.dart';
 import 'package:fluffychat/widgets/matrix.dart';
 
-void connectToHomeserverFlow(
+Future<void> connectToHomeserverFlow(
   PublicHomeserverData homeserverData,
   BuildContext context,
   void Function(AsyncSnapshot<bool>) setState,

lib/utils/size_string.dart

@@ -7,15 +7,15 @@ extension SizeString on num {
     if (size < 1000 * 1000) {
       size = size / 1000;
       size = (size * 10).round() / 10;
-      return '${size.toString()} KB';
+      return '$size KB';
     }
     if (size < 1000 * 1000 * 1000) {
       size = size / 1000000;
       size = (size * 10).round() / 10;
-      return '${size.toString()} MB';
+      return '$size MB';
     }
     size = size / 1000 * 1000 * 1000 * 1000;
     size = (size * 10).round() / 10;
-    return '${size.toString()} GB';
+    return '$size GB';
   }
 }

lib/utils/url_launcher.dart

@@ -27,7 +27,7 @@ class UrlLauncher {
 
   const UrlLauncher(this.context, this.url, [this.name]);
 
-  void launchUrl() async {
+  Future<void> launchUrl() async {
     if (url!.toLowerCase().startsWith(AppConfig.deepLinkPrefix) ||
         url!.toLowerCase().startsWith(AppConfig.inviteLinkPrefix) ||
         {'#', '@', '!', '+', '\$'}.contains(url![0]) ||
@@ -117,7 +117,7 @@ class UrlLauncher {
     );
   }
 
-  void openMatrixToUrl() async {
+  Future<void> openMatrixToUrl() async {
     final matrix = Matrix.of(context);
     final url = this.url!.replaceFirst(
       AppConfig.deepLinkPrefix,