Backport inclusion of b64 w3 CG icon from gcds-map (broken link)

Author: prushforth

src/mapml/control/AttributionButton.js

@@ -82,9 +82,9 @@ Map.addInitHook(function () {
 });
 
 export var attributionButton = function (opts) {
-  /* jshint ignore:start */
-  const w3icon = new URL('images/w3community.ico', import.meta.url).href;
-  /* jshint ignore:end */
+  // Inline the icon as data URL to avoid asset path resolution issues
+  const w3icon =
+    'data:image/x-icon;base64,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';
   const options = Object.assign(opts, {
     prefix: `<img src="${w3icon}" style="position: relative; top: 5px" alt="W3C Community and Business Groups logo"> <a href="https://www.w3.org/community/maps4html/">Maps for HTML Community Group</a> | <img src="data:image/svg+xml;base64,PHN2ZyBhcmlhLWhpZGRlbj0idHJ1ZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB3aWR0aD0iMTIiIGhlaWdodD0iOCI+PHBhdGggZmlsbD0iIzRDN0JFMSIgZD0iTTAgMGgxMnY0SDB6Ii8+PHBhdGggZmlsbD0iI0ZGRDUwMCIgZD0iTTAgNGgxMnYzSDB6Ii8+PHBhdGggZmlsbD0iI0UwQkMwMCIgZD0iTTAgN2gxMnYxSDB6Ii8+PC9zdmc+" style="padding-right: 0.3em;" alt="Slava Ukraini"> <a href="https://leafletjs.com" title="A JS library for interactive maps">Leaflet</a> `
   });