💡 Timeline Item Snapping

Current issue:
Timeline items don’t snap. If you drag an item slightly over another, it jumps to a random open space on another layer, often disappearing from view.

What it should do:

• Timeline items should snap to a fixed grid (e.g. every 0.5s).

• Items should stay on their current row unless deliberately moved.

• No auto-jumping to other layers.

• Show feedback if placement isn’t allowed (e.g. red outline).