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/webpack/lib/runtime/RelativeUrlRuntimeModule.js

@@ -0,0 +1,44 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+*/
+
+"use strict";
+
+const RuntimeGlobals = require("../RuntimeGlobals");
+const Template = require("../Template");
+const HelperRuntimeModule = require("./HelperRuntimeModule");
+
+/** @typedef {import("../Compilation")} Compilation */
+
+class RelativeUrlRuntimeModule extends HelperRuntimeModule {
+	constructor() {
+		super("relative url");
+	}
+
+	/**
+	 * @returns {string | null} runtime code
+	 */
+	generate() {
+		const compilation = /** @type {Compilation} */ (this.compilation);
+		const { runtimeTemplate } = compilation;
+		return Template.asString([
+			`${RuntimeGlobals.relativeUrl} = function RelativeURL(url) {`,
+			Template.indent([
+				'var realUrl = new URL(url, "x:/");',
+				"var values = {};",
+				"for (var key in realUrl) values[key] = realUrl[key];",
+				"values.href = url;",
+				'values.pathname = url.replace(/[?#].*/, "");',
+				'values.origin = values.protocol = "";',
+				`values.toString = values.toJSON = ${runtimeTemplate.returningFunction(
+					"url"
+				)};`,
+				"for (var key in values) Object.defineProperty(this, key, { enumerable: true, configurable: true, value: values[key] });"
+			]),
+			"};",
+			`${RuntimeGlobals.relativeUrl}.prototype = URL.prototype;`
+		]);
+	}
+}
+
+module.exports = RelativeUrlRuntimeModule;