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/RuntimeIdRuntimeModule.js

@@ -0,0 +1,33 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+*/
+
+"use strict";
+
+const RuntimeGlobals = require("../RuntimeGlobals");
+const RuntimeModule = require("../RuntimeModule");
+
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../ChunkGraph")} ChunkGraph */
+
+class RuntimeIdRuntimeModule extends RuntimeModule {
+	constructor() {
+		super("runtimeId");
+	}
+
+	/**
+	 * @returns {string | null} runtime code
+	 */
+	generate() {
+		const chunkGraph = /** @type {ChunkGraph} */ (this.chunkGraph);
+		const chunk = /** @type {Chunk} */ (this.chunk);
+		const runtime = chunk.runtime;
+		if (typeof runtime !== "string") {
+			throw new Error("RuntimeIdRuntimeModule must be in a single runtime");
+		}
+		const id = chunkGraph.getRuntimeId(runtime);
+		return `${RuntimeGlobals.runtimeId} = ${JSON.stringify(id)};`;
+	}
+}
+
+module.exports = RuntimeIdRuntimeModule;