feature: add chat sound mute toggle

[zeeshaun]

Summary

Adds a chat sound mute toggle to chat surfaces so players can silence incoming chat notifications while staying in chat.

Changes

• Adds speaker/mute controls to the chat lobby header and right-side chat panel.
• Shares useSound() state across callers so the toggle and notification playback use the same enabled state.
• Persists the setting through the existing chat-sound-enabled localStorage key.
• Prevents both notification beeps from playing when chat sound is muted.

Validation

• Manually tested locally with two Steam accounts on the same match chat:
  • Verified the chat mute button appears in the match/right chat panel.
  • Verified muting sets localStorage.chat-sound-enabled to false and persists after refresh.
  • Verified incoming messages from the second account do not play a sound while muted.
  • Verified incoming messages play the notification sound again after unmuting.

Change was tested locally through the running Tilt dev stack.

[lukepolo]

can you also add auto mute when they are in a match and in game?

[lukepolo]

let me know when its ready , so far it looks good , not sure what testing you need todo etc

[zeeshaun]

I tested in the browser using devtools and added a vitest unit test.

I did not have a server spin up locally and test though.

[lukepolo]

this messed up the input positioning