Interface DirtyTile

Batched collision layer updates when tiles change. Queues changed tile positions and rebuilds collision in bulk.

Usage:

const rebuilder = new CollisionRebuilder();
rebuilder.markDirty(5, 3);
rebuilder.markDirty(5, 4);
// At end of frame or after batch operations:
const dirtyTiles = rebuilder.flush();
for (const { x, y } of dirtyTiles) {
  tilemapLayer.setCollision(x, y, ...);
}
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