Mild fixes to issues I noticed on push

lib/assets.dart

@@ -1,4 +1,3 @@
-import 'dart:developer';
 import 'dart:ui' as ui;
 
 import 'package:flutter/services.dart';
@@ -7,7 +6,7 @@ class Assets {
   final Map<String, ui.Image> _loaded = {};
   final Set<String> _waiting = {};
 
-  Future<ui.Image> getImageAsync(String name) async {
+  Future<ui.Image> _getImageAsync(String name) async {
     final assetImageByteData = await rootBundle.load(name);
     final codec =
         await ui.instantiateImageCodec(assetImageByteData.buffer.asUint8List());
@@ -20,7 +19,7 @@ class Assets {
   ui.Image? getImageIfAvailable(String name) {
     if (!_waiting.contains(name)) {
       _waiting.add(name);
-      getImageAsync(name);
+      _getImageAsync(name);
     }
     return _loaded[name];
   }