Remove flutter chat (#26)

Had to squash merge manually as Forgejo was erroring

lib/helpers/extensions/size_to_string.dart

@@ -0,0 +1,22 @@
+import "package:fast_immutable_collections/fast_immutable_collections.dart";
+
+extension SizeToString on int {
+  String get sizeAsString {
+    const IListConst<String> suffixes = IListConst([
+      "B",
+      "KB",
+      "MB",
+      "GB",
+      "TB",
+      "PB",
+    ]);
+
+    var i = 0;
+    var size = toDouble();
+    while (size > 1024 && i < suffixes.length - 1) {
+      size /= 1024;
+      i++;
+    }
+    return "${size.toStringAsFixed(2)} ${suffixes[i]}";
+  }
+}