tweaks

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/utils/extension/num_ext.dart

@@ -0,0 +1,15 @@
+import 'package:flutter/widgets.dart';
+
+extension ImageExtension on num {
+  int? cacheSize(BuildContext context) {
+    if (this == 0) {
+      return null;
+    }
+    return (this * MediaQuery.devicePixelRatioOf(context)).round();
+  }
+}
+
+extension IntExt on int? {
+  int? operator +(int other) => this == null ? null : this! + other;
+  int? operator -(int other) => this == null ? null : this! - other;
+}