Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/html-minifier-terser/src/utils.js

@@ -0,0 +1,31 @@
+'use strict';
+
+function createMap(values, ignoreCase) {
+  var map = {};
+  values.forEach(function(value) {
+    map[value] = 1;
+  });
+  return ignoreCase ? function(value) {
+    return map[value.toLowerCase()] === 1;
+  } : function(value) {
+    return map[value] === 1;
+  };
+}
+
+async function replaceAsync(str, regex, asyncFn) {
+  const promises = [];
+  str.replace(regex, (match, ...args) => {
+    const promise = asyncFn(match, ...args);
+    promises.push(promise);
+  });
+  const data = await Promise.all(promises);
+  return str.replace(regex, () => data.shift());
+}
+
+
+exports.createMap = createMap;
+exports.createMapFromString = function(values, ignoreCase) {
+  return createMap(values.split(/,/), ignoreCase);
+};
+
+exports.replaceAsync = replaceAsync;