Feature request: Keypress Sound Effects

**Describe the solution you'd like**
It would be wonderful if keypress sound effects could be added, similar to those in Monkeytype. Having hotkeys to enable or disable the sounds, as well as options to adjust the volume, would be greatly appreciated.

No files, tests, or entry points are named in the issue. First clarify where keyboard events and audio settings are handled, then define acceptance criteria for enabling or disabling sounds, hotkeys, and volume; done means all requested controls work in the OverKeys desktop app.

Written by the indexing model from the issue text.