Adjust Flatpak runtime launch settings

forge.config.js

@@ -53,6 +53,7 @@ module.exports = {
           categories: ['Science'],
           finishArgs: [
             '--share=ipc',
+            '--share=network',
             '--socket=x11',
             '--socket=wayland',
             '--device=dri',

main.js

@@ -1,9 +1,24 @@
+const fsNode = require('fs');
 const { app, BrowserWindow, Menu, dialog, ipcMain, fs } = require('electron');
 
+function isFlatpakRuntime() {
+    return process.platform === 'linux' && (
+        !!process.env.FLATPAK_ID ||
+        process.env.container === 'flatpak' ||
+        fsNode.existsSync('/.flatpak-info')
+    );
+}
+
 // Some Linux/remote desktop setups expose a broken GPU context to Electron.
 // Fall back to software rendering instead of crashing on startup.
 app.disableHardwareAcceleration();
 
+if (isFlatpakRuntime()) {
+    // The packaged Flatpak currently runs without chrome-sandbox, so Chromium
+    // needs the explicit no-sandbox flag at startup.
+    app.commandLine.appendSwitch('no-sandbox');
+}
+
 if (process.platform === 'linux') {
     // The XDG portal dialog backend ignores defaultPath on some systems and
     // may cancel folder selection entirely in X11/SSH sessions.