Add browser support with Socket.io transport, authentication, performance-optimized IPC, and CI/CD (#925)

.github/copilot-instructions.md

@@ -25,6 +25,10 @@ yarn install
 # Build the project
 yarn build
 
+# Set password for browser testing
+export MQTT_EXPLORER_USERNAME=admin
+export MQTT_EXPLORER_PASSWORD=secretpassword
+
 # Start the application
 yarn start
 
@@ -322,5 +326,5 @@ yarn package-with-docker
 - The app uses Electron (see `package.json` for version)
 - MQTT communication is handled via [mqttjs](https://github.com/mqttjs/MQTT.js)
 - All code changes should pass linting (`yarn lint`)
-- Node.js version requirement: >= 18
+- Node.js version requirement: >= 20
 - The project uses workspace-like structure with separate package.json files for app and backend