Function calculateTimeSync

calculateTimeSync(
    clientSendTime: number,
    clientReceiveTime: number,
    serverTime: number,
): { offset: number; rtt: number }
Computes the clock offset and round-trip time between client and server.

Uses a simplified NTP-style calculation:
- RTT = clientReceiveTime - clientSendTime
- Offset = (serverTime + RTT/2) - clientReceiveTime
Parameters
- clientSendTime: number
  Timestamp (ms) when the PING was sent.
- clientReceiveTime: number
  Timestamp (ms) when the PONG was received.
- serverTime: number
  Server timestamp (ms) included in the PONG payload.
Returns { offset: number; rtt: number }
An object with offset (ms to add to Date.now() for server time) and rtt (round-trip time in ms).
- Defined in time-sync.ts:27