web/recordings: a move cursor while the pointer drags

The cast already marks the button in the ptr track ([x, y, 1]); the player
now remembers the cell where it went down and, the moment the pointer
leaves it, swaps the arrow for a four-way move cursor (a clip-path, like
the arrow) centred on the old tip. A still click never triggers it, so
the border-click split keeps its arrow while the gap drag and both
pane-carries in the panes demo read as carrying. Player-side only: every
existing cast gets it without re-rendering.

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