TF-1014: add covert bytes to gb and edit UI

core/lib/utils/double_convert.dart

@@ -0,0 +1,7 @@
+import 'dart:math';
+
+class DoubleConvert {
+  static double bytesToGigaBytes(num bytes) {
+    return double.tryParse((bytes * 9.31 * pow(10, -10)).toStringAsFixed(2)) ?? 0;
+  }
+}