Function setTokenExpiryState

setTokenExpiryState(timestamp: null | number): void
Sets the in-memory token expiry timestamp

Updates the token expiration timestamp in memory for future validity checks. This function does not persist the timestamp to storage - that responsibility belongs to the token operations module.
Parameters
- timestamp: null | number
  Token expiry timestamp (milliseconds since epoch) to store in memory, or null to clear
Returns void
Example
```
// Calculate and set expiry timestamp
const expiryMs = Date.now() + (expiresIn * 1000);
setTokenExpiryState(expiryMs);
```
Source
```
export function setTokenExpiryState(timestamp: number | null): void {
  tokenExpiryTimestamp = timestamp;
}
```
- Defined in src/services/auth/storage/token-state.ts:182

src