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

lib/helpers/file_helpers.dart

@@ -1,3 +0,0 @@
-String extractFilenameFromPath(String path) {
-  return path.split(RegExp('[./]')).reversed.skip(1).first;
-}

lib/helpers/image_helpers.dart

@@ -1,38 +0,0 @@
-// Taken from https://github.com/flutter/flutter/issues/26127#issuecomment-782083060
-import 'dart:async';
-import 'dart:ui';
-
-import 'package:flutter/foundation.dart';
-import 'package:flutter/services.dart';
-import 'package:flutter/widgets.dart';
-
-Future<void> loadImage(ImageProvider provider) {
-  final config = ImageConfiguration(
-    bundle: rootBundle,
-    devicePixelRatio: window.devicePixelRatio,
-    platform: defaultTargetPlatform,
-  );
-  final Completer<void> completer = Completer();
-  final ImageStream stream = provider.resolve(config);
-
-  late final ImageStreamListener listener;
-
-  listener = ImageStreamListener((ImageInfo image, bool sync) {
-    debugPrint("Image ${image.debugLabel} finished loading");
-    completer.complete();
-    stream.removeListener(listener);
-  }, onError: (dynamic exception, StackTrace? stackTrace) {
-    completer.complete();
-    stream.removeListener(listener);
-    FlutterError.reportError(FlutterErrorDetails(
-      context: ErrorDescription('image failed to load'),
-      library: 'image resource service',
-      exception: exception,
-      stack: stackTrace,
-      silent: true,
-    ));
-  });
-
-  stream.addListener(listener);
-  return completer.future;
-}