Add hidden dev debug console (v0.5.0)

desktop/preload.js

@@ -2,4 +2,7 @@ const { contextBridge, ipcRenderer } = require('electron');
 
 contextBridge.exposeInMainWorld('MSDesktop', {
   quit: () => ipcRenderer.send('ms-quit'),
+  // true only when launched with --dev (forwarded as --ms-dev via additionalArguments);
+  // enables the hidden debug console
+  dev: process.argv.includes('--ms-dev') || process.argv.includes('--dev'),
 });