[popups] Enable scroll lock on touch when modal

[atomiks]

Fixes #3098

Since touchmove is used, swiping still allows swipe-outside-to-dismiss to work, so the end result is mostly identical except with a slightly increased dead zone where scroll doesn't happen.

This enables use cases like a popover that covers the whole screen (to use the anchoring behavior over Dialog) where the background scroll remains locked

[pkg-pr-new[bot]]

vite-css-base-ui-example

pnpm add https://pkg.pr.new/mui/base-ui/@base-ui-components/react@3100

pnpm add https://pkg.pr.new/mui/base-ui/@base-ui-components/utils@3100

commit: c4bf638

[mui-bot]

Bundle size report

Bundle	Parsed size	Gzip size
@base-ui-components/react	▼-106B(-0.03%)	▼-41B(-0.03%)

Details of bundle changes

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[atomiks]

Issue: on iOS, when scroll is activated (navbar expanded), this prevents scroll when swiping to dismiss

For the Popover use case, it seems like the structure in https://github.com/mui/base-ui/pull/3183 would work better (across all platforms/browsers)