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/import-fresh/index.js

@@ -0,0 +1,34 @@
+'use strict';
+const path = require('path');
+const resolveFrom = require('resolve-from');
+const parentModule = require('parent-module');
+
+module.exports = moduleId => {
+	if (typeof moduleId !== 'string') {
+		throw new TypeError('Expected a string');
+	}
+
+	const parentPath = parentModule(__filename);
+
+	const cwd = parentPath ? path.dirname(parentPath) : __dirname;
+	const filePath = resolveFrom(cwd, moduleId);
+
+	const oldModule = require.cache[filePath];
+	// Delete itself from module parent
+	if (oldModule && oldModule.parent) {
+		let i = oldModule.parent.children.length;
+
+		while (i--) {
+			if (oldModule.parent.children[i].id === filePath) {
+				oldModule.parent.children.splice(i, 1);
+			}
+		}
+	}
+
+	delete require.cache[filePath]; // Delete module from cache
+
+	const parent = require.cache[parentPath]; // If `filePath` and `parentPath` are the same, cache will already be deleted so we won't get a memory leak in next step
+
+	// In case cache doesn't have parent, fall back to normal require
+	return parent === undefined || parent.require === undefined ? require(filePath) : parent.require(filePath);
+};