Force Linux file dialogs off XDG portal

main.js

@@ -4,6 +4,12 @@ const { app, BrowserWindow, Menu, dialog, ipcMain, fs } = require('electron');
 // Fall back to software rendering instead of crashing on startup.
 app.disableHardwareAcceleration();
 
+if (process.platform === 'linux') {
+    // The XDG portal dialog backend ignores defaultPath on some systems and
+    // may cancel folder selection entirely in X11/SSH sessions.
+    app.commandLine.appendSwitch('xdg-portal-required-version', '999');
+}
+
 function getDefaultDialogPath() {
     return process.cwd();
 }