[Guiw5]

Cause: handleDrag calls cancel() in the tap and swipe-down dismiss branches. In @use-gesture 10.3.1, DragEngine.cancel() re-runs the handler on a setTimeout(0) with canceled: true and the same tap/movement state, so it reaches the dismiss branch again: one tap or one swipe calls onDismiss twice (consumers that navigate on dismiss go back two entries).

Fix: handleDrag returns early when the gesture state is canceled.

Test: two tests in test/bottom-sheet.test.tsx drive a backdrop tap and a header swipe-down with pointer events and expect exactly one onDismiss call; both failed with 2 calls before the fix.