feat(electron): detect Snap/AppImage and adjust sandboxing

Detect Snap and AppImage environments at startup and adjust the
renderer sandbox and GPU sandbox accordingly. Add env checks in
main.ts and app.ts to determine if process.env.SNAP or
process.env.APPIMAGE is set. When running inside Snap or AppImage,
append the disable-gpu-sandbox command line switch and disable the
renderer sandbox for BrowserWindow by setting sandbox: false.

This prevents conflicts between Electron's sandboxing/GPU sandbox
and confinement used by Snap/AppImage packages, improving stability
for packaged Linux builds.

Author: 4gray

apps/electron-backend/src/app/app.ts

@@ -65,6 +65,10 @@ export default class App {
 
         const savedWindowBounds = store.get(WINDOW_BOUNDS);
 
+        // Detect if running in Snap or AppImage environment
+        const isSnap = process.env.SNAP !== undefined;
+        const isAppImage = process.env.APPIMAGE !== undefined;
+
         // Create the browser window.
         App.mainWindow = new BrowserWindow({
             title: 'IPTVnator',
@@ -75,6 +79,9 @@ export default class App {
                 contextIsolation: true,
                 backgroundThrottling: false,
                 preload: join(__dirname, 'main.preload.js'),
+                // Enable sandbox by default, it will be automatically adjusted
+                // based on command line switches set in main.ts
+                sandbox: !(isSnap || isAppImage),
             },
             ...savedWindowBounds,
             minHeight: 600,

apps/electron-backend/src/main.ts

@@ -14,6 +14,16 @@ import SquirrelEvents from './app/events/squirrel.events';
 import StalkerEvents from './app/events/stalker.events';
 import XtreamEvents from './app/events/xtream.events';
 
+// Detect if running in Snap or AppImage environment
+const isSnap = process.env.SNAP !== undefined;
+const isAppImage = process.env.APPIMAGE !== undefined;
+
+// Handle sandbox for Snap and AppImage
+if (isSnap || isAppImage) {
+    // Disable GPU sandbox which often conflicts with snap/AppImage confinement
+    app.commandLine.appendSwitch('disable-gpu-sandbox');
+}
+
 app.setName('iptvnator');
 
 export default class Main {