fix(dom): bubble drop target state to droppable ancestors (closes #1812)

[timagixe]

Summary

Fixes isDropTarget so DOM droppable ancestors become active when a nested droppable is the current drop target.

Closes #1812

Details

• Bubbles drop target state through DOM ancestry instead of collision candidates
• Keeps disabled and non-accepting droppables inactive
• Adds regression coverage for nested targets and unrelated colliding siblings

Verification

• bun test packages/dom/tests
• bun test packages/abstract/tests
• bun run build

[changeset-bot]

🦋 Changeset detected

Latest commit: 589e867

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: 589e867