feat: interface sounds

e2e/lib/app.mjs

@@ -156,6 +156,9 @@ export class AppSession {
             // A tip opening by itself mid-test is a modal nobody asked for;
             // the tips suite turns it back on for the one session that wants it.
             tips_auto_show: false,
+            // Hundreds of scripted clicks must not play through the speakers
+            // of the machine running the suite.
+            ui_sounds: false,
             ...this.settings,
           },
           null,

e2e/tests/ui.test.mjs

@@ -2279,6 +2279,24 @@ test("first-run onboarding stays recoverable, responsive, and platform-aware", a
   );
 });
 
+test("interface sounds turn on and off in Appearance and stay as saved", async () => {
+  await withApp("ui-sounds-setting", async (app) => {
+    const sounds = async () => (await app.invoke("get_app_settings")).ui_sounds;
+    assert.equal(await sounds(), false, "the harness keeps the suite silent");
+    await app.clickSelector('[aria-label="Settings"]');
+    await app.waitForText(en.settings.appearance.soundsDescription);
+    const toggle = `[role="switch"][aria-label="${en.settings.appearance.sounds}"]`;
+    await app.clickSelector(toggle);
+    await saveSettings(app);
+    assert.equal(await sounds(), true);
+    await app.clickSelector(toggle);
+    await saveSettings(app);
+    assert.equal(await sounds(), false);
+    await app.restart();
+    assert.equal(await sounds(), false, "the choice survives a restart");
+  });
+});
+
 test("predefined theme remains rendered across navigation and restart", async () => {
   await withApp("ui-theme-predefined", async (app) => {
     await app.clickSelector('[aria-label="Settings"]');