[BUG] scroll()/useScroll report elastic overscroll as forward scroll

2. Describe the bug

During elastic overscroll at the top of the page (Safari's rubber-band, macOS and iOS), window.scrollY goes negative but useScroll().scrollY / info.y.current report the unsigned magnitude, so a 25px pull reads as 25px of forward scroll. Cause: the unconditional Math.abs in updateAxisInfo (added in abaf16e for #3340's reverse-direction containers) also folds the sign of transient overscroll in normal containers.

3. CodeSandbox reproduction

https://codesandbox.io/p/sandbox/3dmxgc

4. Steps to reproduce

1. Open the sandbox preview in Safari, scrolled to the top.
2. Pull up so the page rubber-bands.
3. The readout shows window.scrollY negative while info.y.current reports it positive.

5. Expected behavior

Normal containers keep the signed offset, matching window.scrollY; reverse-direction containers keep the normalized values from #3340; progress stays within [0, 1].

6. Video or screenshots

https://github.com/user-attachments/assets/f510241f-bf39-4c55-88cd-954eef0c29d1

Covered by the sandbox readout.

7. Environment details

motion 12.43.0, also present on current main. Reproduced in Safari on macOS.

Fix branch linked in the comment below.