Fixed three critical multiplayer issues:
1. **Fixed interval restart bug**: Position broadcast interval was constantly restarting
because useEffect depended on `compatibleState`, which changed on every position
update. Now uses stable dependencies (`multiplayerState.gamePhase`, etc.)
2. **Increased broadcast frequency**: Changed from 200ms (5 Hz) to 100ms (10 Hz)
for smoother ghost train movement during multiplayer races
3. **Fixed position reset on reload**: Client position now syncs from server's
authoritative position when browser reloads, preventing trains from resetting
to start of track
Additional fixes:
- Used refs for `sendMove` to prevent interval recreation
- Removed unused imports (useEffect from GhostTrain, SteamTrainJourney)
- Added strategic logging for position broadcast and reception
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Co-Authored-By: Claude <noreply@anthropic.com>
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