Function applySpriteTint

applySpriteTint(
    ctx: CanvasRenderingContext2D,
    w: number,
    h: number,
    color: string,
): void
Apply a color tint overlay to the current canvas content

Uses source-atop composite operation to tint existing pixels while preserving alpha.
Parameters
- ctx: CanvasRenderingContext2D
  Canvas 2D rendering context
- w: number
  Width in pixels
- h: number
  Height in pixels
- color: string
  Tint color (CSS color string)
Returns void
Example
```
applySpriteTint(ctx, 24, 24, '#ff0000'); // Tint to red
```
- Defined in ops/sprite-tint.ts:18