Sounds:
- Add chat sounds (global, map, DM) converted from game client ogg to caf
- Audio category .ambient (mixes with other audio, respects silent switch)
- Per-buffer sound toggles and background buffer sound option in Settings
Messages:
- Card-style message rows with .regularMaterial background, bumped fonts (content .title3, sender .headline)
- Context menu and VoiceOver actions: DM and Show Profile on other players' messages
- Generate local UUIDs for message identity (server ID field is not unique, caused ForEach to collapse messages)
Own-message detection:
- Capture player entity ID from LoadInstance packet (Key 1) on game join
- Hide DM/Profile actions on own messages via senderId comparison
Crash fix:
- Guard all UInt64 timestamp subtractions against underflow (retransmitPending, ping, disconnect timeout)
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