Infinite Drag Canvas

A grid you can throw in any direction that never runs out. Tiles are keyed by column and row, built as the viewport approaches and destroyed once it passes, with the buffer biased toward the direction of travel so a fast fling still arrives on populated space. Release keeps the last measured velocity and coasts. Clicking a tile hides the original, spawns a free copy at its exact screen box, and grows it to a centered plate, so the expand starts where you clicked.