fix(sounds): Clear all sounds on test finish (@Leonabcd123) (monkeytypegame#7196)

### Description

Use `Howler.stop()` to stop all sounds after finishing a test.

Closes monkeytypegame#7194

Author: Leonabcd123

frontend/src/ts/controllers/sound-controller.ts

@@ -638,6 +638,11 @@ export async function playTimeWarning(): Promise<void> {
   soundToPlay.play();
 }
 
+export async function clearAllSounds(): Promise<void> {
+  const Howl = (await gethowler()).Howler;
+  Howl.stop();
+}
+
 function playNote(
   codeOverride?: string,
   oscillatorTypeOverride?: SupportedOscillatorTypes,

frontend/src/ts/test/test-logic.ts

@@ -12,6 +12,7 @@ import * as CustomText from "./custom-text";
 import * as CustomTextState from "../states/custom-text-name";
 import * as TestStats from "./test-stats";
 import * as PractiseWords from "./practise-words";
+import * as SoundController from "../controllers/sound-controller";
 import * as ShiftTracker from "./shift-tracker";
 import * as AltTracker from "./alt-tracker";
 import * as Focus from "./focus";
@@ -296,6 +297,7 @@ export function restart(options = {} as RestartOptions): void {
   TestUI.reset();
   CompositionState.setComposing(false);
   CompositionState.setData("");
+  void SoundController.clearAllSounds();
 
   if (TestState.resultVisible) {
     if (Config.randomTheme !== "off") {