feat(P3.T3): app:hostname IPC for device-name default

apps/desktop/electron/main.ts

@@ -12,6 +12,7 @@ import { fileURLToPath } from 'node:url';
 
 import { CHANNELS } from './ipc-types';
 import { register as registerAudioLoopback } from './modules/audio-loopback';
+import { register as registerAppHostname } from './modules/app-hostname';
 import { register as registerAutostart } from './modules/autostart';
 import { register as registerFsScoped } from './modules/fs-scoped';
 import { register as registerNotifications } from './modules/notifications';
@@ -254,6 +255,7 @@ if (!gotLock) {
     registerFsScoped();
     registerSql();
     registerAutostart();
+    registerAppHostname();
 
     // Window-dependent registrars — only call once mainWindow exists so
     // event emitters have somewhere to send.