add disk page

app/lib/utils/file_formatter.dart

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+import 'dart:math';
+
+double _log10(num x) => log(x) / ln10;
+
+extension FileFormatter on num {
+  String readableFileSize({bool base1024 = true}) {
+    if (this <= 0) return "0";
+    final base = base1024 ? 1024 : 1000;
+    final units = base1024
+        ? ["Bi", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"]
+        : ["B", "KB", "MB", "GB", "TB", "PB", "EB"];
+    final digitGroups = (_log10(this) / _log10(base)).floor();
+    return "${(this / pow(base, digitGroups)).toStringAsFixed(2)} ${units[digitGroups]}";
+  }
+}