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/app/src/utils/host-routes.test.ts

@@ -262,6 +262,10 @@ describe("host settings section slugs", () => {
 });
 
 describe("settings section slugs", () => {
+  it("includes desktop notification settings", () => {
+    expect(isSettingsSectionSlug("notifications")).toBe(true);
+  });
+
   it("no longer treats daemon as a valid app-level settings section", () => {
     expect(isSettingsSectionSlug("daemon")).toBe(false);
   });

packages/app/src/utils/host-routes.ts

@@ -495,6 +495,7 @@ export const SETTINGS_SECTION_SLUGS = [
   "editor",
   "shortcuts",
   "integrations",
+  "notifications",
   "permissions",
   "diagnostics",
   "about",