Function dampedSpring

dampedSpring(
    current: number,
    target: number,
    velocity: { value: number },
    stiffness: number,
    damping: number,
    deltaTime: number,
): number
Damped spring interpolation for scalar values.

Smoothly interpolates a value toward a target using spring physics. Useful for camera smoothing, UI animations, or any single-value spring behavior.
Parameters
- current: number
  Current value
- target: number
  Target value to reach
- velocity: { value: number }
  Velocity object (modified in place)
- stiffness: number
  Spring stiffness (higher = faster)
- damping: number
  Damping factor (higher = less oscillation)
- deltaTime: number
  Time step in seconds
Returns number
New interpolated value
Example
```
// Smooth camera zoom
const velocity = { value: 0 };
let currentZoom = 5;
const targetZoom = 10;

// In update loop
currentZoom = dampedSpring(
  currentZoom,
  targetZoom,
  velocity,
  10,  // stiffness
  5,   // damping
  deltaTime
);
camera.position.z = currentZoom;
```
- Defined in src/core/kinematics.ts:1770