fix(dom): preserve scroll position so drag feedback doesn't jump

[ronakradadiya]

Summary

Closes #2089.

In Safari, the dragged element jumps up a row when a scroll container is scrolled to its end — both the page itself and nested scrollable containers.

Taking the source out of flow shrinks the scrollable content, so a container scrolled to its end has its scrollTop clamped by the browser (notably Safari), which leaves the fixed feedback element a row off. The fix captures each scrollable ancestor's offset before the source leaves the flow and restores it once the placeholder restores the content size.

Changes

• Capture every scrollable ancestor's offset before promoting the source element.
• Restore any offsets that were clamped, after the placeholder restores the content size.
• Covers both the page (window) and nested scroll containers.

Testing

• bun run build
• bun run test
• Verified manually in Safari on the Basic setup (page scroll) and Nested scroll stories: scroll to the bottom, drag an item, it now stays aligned with its slot instead of jumping up a row.

[changeset-bot]

🦋 Changeset detected

Latest commit: 9ecec66

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 10 packages

Name	Type
@dnd-kit/dom	Patch
@dnd-kit/abstract	Patch
@dnd-kit/collision	Patch
@dnd-kit/geometry	Patch
@dnd-kit/helpers	Patch
@dnd-kit/react	Patch
@dnd-kit/state	Patch
@dnd-kit/vue	Patch
@dnd-kit/solid	Patch
@dnd-kit/svelte	Patch

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commit: 9ecec66