Show byte count in children view

public/common/explorer.js

@@ -1,6 +1,7 @@
 // @ts-check
 
 import crel, { fragment } from "./crel.js";
+import pluralize from "./pluralize.js";
 import formatBytes from "./formatBytes.js";
 import allChildrenOf from "./allChildrenOf.js";
 import * as nodePath from "./nodePath.js";
@@ -187,7 +188,7 @@ const traverse = (node, path, getNodeUi) => {
       crel(
         "span",
         { "class": "bytecount" },
-        "TODO: X bytes",
+        pluralize(node.bytes.byteLength, "byte"),
       ),
     ),
     description,