Split workspace into electron and ui packages

BUILD.md

@@ -10,6 +10,12 @@ This guide explains how to build distributable binaries for CodeNomad.
 
 ## Quick Start
 
+All commands now run inside the workspace packages. From the repo root you can target the Electron app package directly:
+
+```bash
+npm run build --workspace @codenomad/electron-app
+```
+
 ### Build for Current Platform (macOS default)
 
 ```bash