fix(desktop): restore notification sounds (#2582)

Restore desktop notification sounds by default, add a persisted Play sound setting, and group notification permission and testing in a dedicated Notifications section.

packages/desktop/src/features/notifications.ts

@@ -1,6 +1,7 @@
 import path from "node:path";
 import { existsSync } from "node:fs";
 import { app, BrowserWindow, Notification, ipcMain, nativeImage } from "electron";
+import { getDesktopSettingsStore } from "../settings/desktop-settings-electron.js";
 
 interface NotificationInput {
   title?: unknown;
@@ -95,11 +96,12 @@ export function registerNotificationHandlers(): void {
     const body = toTrimmedString(rawInput?.body) ?? undefined;
     const data = toRecord(rawInput?.data);
     const icon = getNotificationIcon();
+    const settings = await getDesktopSettingsStore().get();
     const notification = new Notification({
       title,
       ...(body ? { body } : {}),
       ...(icon ? { icon } : {}),
-      silent: true,
+      silent: !settings.notifications.playSound,
     });
 
     activeNotifications.add(notification);