[vjeux]

Depends on #8175 and #8665 (with #8666's pen driver). Carries #8562 (Core's internal entries) as a dependency; if the entries land differently, this follows her decision. Review only this PR's change: vjeux/astryx@01e856a...2758073; later heads only merge #8175, #8665 and #8666.

Why

With a mouse or a stylus, nothing pulls to refresh: the pull reads only a finger, so a drag at the top of a refreshable list does nothing.

What led to it

Part of the touch-presentations program (spec:AST-094). Its FR43, now on main, has gestures run for every pointer, keeping off only what it lists; the pull to refresh isn't on that list.

Options and tradeoffs

• Keep the mouse off, as a row swipe is: FR43 doesn't list it.
• Take the top edge under every pointer: under a fine pointer, overscroll-behavior: none would remove the page's own rubber band, with no pull to replace it for a wheel.
• One pull for every pointer, leaving the top edge to the browser under a fine pointer.

Why this choice

The third follows FR43 with the least new behavior: every pointer shares one mapping, trigger, settle and drawing. Under a fine pointer the browser keeps its own overscroll at the page's top, and the control watches no scroll (FR24). A pen's or a mouse's pull clears the text selection its drag started, then holds selection off, as a finger's does. Under Reduce Motion a release cross-fades where a finger let go or the primary pointer is coarse (design:reduced-motion DR2) and lands at once elsewhere (DR3). A trackpad's or a wheel's scroll follows in #8697.

How to check it

In a desktop browser, on the RefreshControl story "On the page":

1. Drag down from the top with the mouse: the content follows, the spinner turns past the trigger, and on release it settles under the spinner until the refresh ends.
2. Start the drag on text: the selection it began is cleared, and nothing is selected while pulling.
3. Turn on Reduce Motion and release a pull: the content lands at once.

Evidence

• Each step failed before the change and passes now: 27 of 27 in Chromium; 19 in WebKit, where 8 pen and trace cases are skipped (Playwright's WebKit has no pen).
• New unit tests fail first: a pen or a mouse pulls as a finger does and clears its drag's selection; under a fine pointer the control holds no scroll listener.
• touch-support-bundle fails because this branch carries fix(useScrollLock): keep the page where it is while an overlay is open #8098's scroll lock; test(core): a touch component's import carries its gesture code, and nothing else does #8671's per-component test replaces it and passes here.
• Size: RefreshControl 57.4 → 57.5 KB gzip JavaScript; CSS unchanged.