Function calculateLookAhead

calculateLookAhead(
    velocity: Vector3,
    lookAheadDistance: number,
    lookAheadSmoothing: number,
    currentLookAhead: Vector3,
    deltaTime: number,
): Vector3
Calculate velocity-based look-ahead offset for dynamic cameras.

Points the camera slightly ahead of a moving target based on its velocity. Creates a more responsive feel in third-person or follow cameras.
Parameters
- velocity: Vector3
  Current target velocity (units/sec)
- lookAheadDistance: number
  How far ahead to look in world units
- lookAheadSmoothing: number
  Smoothing time for look-ahead changes
- currentLookAhead: Vector3
  Current look-ahead vector (mutated)
- deltaTime: number
  Time elapsed since last frame (seconds)
Returns Vector3
New look-ahead offset vector
Example
```
const lookAhead = calculateLookAhead(
  targetVelocity,
  3.0,  // Look 3 units ahead
  0.4,  // Smooth over 0.4 seconds
  currentLookAhead,
  deltaTime
);
camera.lookAt(targetPos.clone().add(lookAhead));
```
- Defined in src/core/camera.ts:532