[drawer] Ignore the page scroller when starting a swipe

[flaviendelangle]

Closes #5566

useSwipeDismiss looks for a scrollable element between the touch target and document.body, and refuses to start (or gates the start on the scroll edge) when it finds one. That search also tests body itself. With a reset such as html, body { height: 100%; overflow: auto }, body is a real scroll container, so a non-modal drawer on a long page can be swiped down but not back up from a lower snap point. Drawer.Viewport already treats body and documentElement as "no scroll container" in its native touchmove handler, so this makes the hook do the same. The page scroller is filtered per axis, so a genuine inner scroller on the other axis still gates the gesture.

The added Chromium test reproduces the reset and fails before the change.

• I have followed (at least) the PR section of the contributing guide.

[pkg-pr-new]

• base-ui-tanstack-start

• vite-css-base-ui-example

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/react@5567
  

  pnpm add https://pkg.pr.new/mui/base-ui/@base-ui/utils@5567
  

commit: 0877f1b

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[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	🔺+63B(+0.01%)	🔺+25B(+0.02%)

Details of bundle changes

Performance

Total duration: 1,240.92 ms +119.69 ms^(+10.7%) | Renders: 76 ⁽⁺⁰⁾ | Paint: 1,980.36 ms +148.31 ms^(+8.1%)

Test	Duration	Renders
Tabs mount (200 instances)	263.89 ms 🔺+64.08 ms(+32.1%)	3 (+0)
Menu mount (300 instances)	98.44 ms 🔺+17.98 ms(+22.3%)	1 (+0)
Select open (500 options)	55.47 ms 🔺+11.53 ms(+26.3%)	14 (+0)

12 tests within noise — details

Metric alarms

Test	Metric	Change
Tabs mount (200 instances)	bench:paint	🔺 +72.17 ms

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