feat: stats and achievements (#45)

### Explanation

_No response_

### Issue

Closes #39

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### Dependencies

- [ ] I have pinned the dependencies to a specific patch version.

### Style

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### Tests

- [ ] My contribution adds new code, and I have added tests to cover it.
- [ ] My contribution modifies existing code, and I have updated the tests to reflect these changes.
- [ ] All new and existing tests pass locally with my changes.
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### Documentation

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### Versioning

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Reviewed-on: #45
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src/lib/sounds/achievement.ts

@@ -0,0 +1,19 @@
+// Achievement sound player using the notification system
+
+import { soundPlayer } from "$lib/notifications";
+import { NotificationType } from "$lib/notifications/types";
+
+export function playAchievementSound() {
+  // Use the soundPlayer which respects global notification settings
+  soundPlayer.play(NotificationType.ACHIEVEMENT);
+}
+
+// Test function for development
+export function testAchievementSound() {
+  try {
+    playAchievementSound();
+    console.log("Achievement sound played successfully!");
+  } catch (error) {
+    console.error("Error playing achievement sound:", error);
+  }
+}