Add React Devtools

ts/windows/main/phase0-devtools.ts

@@ -0,0 +1,14 @@
+// Copyright 2025 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import '../context';
+import { initialize, connectToDevTools } from 'react-devtools-core';
+import { Environment, getEnvironment } from '../../environment';
+
+if (
+  getEnvironment() === Environment.Development &&
+  Boolean(process.env.REACT_DEVTOOLS)
+) {
+  initialize();
+  connectToDevTools();
+}