docs(ui): document async-status and react-query export paths

[pjeweb]

Summary

• Restore the @mapsight/ui README export table for async-status and react-query.
• Add packages/ui/docs/ASYNC_STATUS.md describing the loading/error presentation layer.

[changeset-bot]

🦋 Changeset detected

Latest commit: ee99bde

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

This PR includes changesets to release 0 packages

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[Copilot]

Pull request overview

Updates @mapsight/ui documentation to clarify async-status / loading presentation layering and to restore/expand the README export-path table for async-status and react-query helpers.

Changes:

• Restore and expand packages/ui/README.md export table entries for async-status and react-query, including peer-dependency notes.
• Add packages/ui/docs/ASYNC_STATUS.md documenting the async-status architecture, adapters, and TanStack Query alignment.
• Add a Changesets entry (currently empty).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/ui/README.md	Restores/extends export-path table + links to async-status architecture doc.
packages/ui/docs/ASYNC_STATUS.md	Adds detailed documentation for async-status layering, view model, and display rules.
.changeset/ui-async-status-docs.md	Adds a changeset file (currently missing required content).

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