Deprecate listbox class in favor of floating mode default

[thejackshelton]

What is it?

Data attribute that styles floating behavior

• [ ] Feature / enhancement
• [ ] Bug
• [ ] Docs / tests
• [x] Other

Why is it needed?

It was much more effort on the consumer to use. This gives a much more sensible default.

Checklist:

• [x] My code follows the developer guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have ran pnpm change and documented my changes
• [x] I have add necessary docs (if needed)
• [ ] Added new tests to cover the fix / functionality

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: cc40aedc715009f09c93c3dd7bf42408d5a6cb56

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

This PR includes changesets to release 1 package

| Name | Type | | ----------------- | ----- | | @qwik-ui/headless | Patch |

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