FE-774: add dialog to ds

[alex-e-leon]

🌟 What is the purpose of this PR?

Adds a Dialog component to the design system

Pre-Merge Checklist 🚀

🚢 Has this modified a publishable library?

This PR:

• does not modify any publishable blocks or libraries, or modifications do not need publishing

📜 Does this require a change to the docs?

The changes in this PR:

• are internal and do not require a docs change

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[cursor]

PR Summary

Low Risk
New UI library surface and a minor breaking change to autoFocus typing; no auth, data, or production app logic in the diff.

Overview
Adds a new Dialog to @hashintel/ds-components, built on Ark UI with Dialog.Header, Dialog.Body, and Dialog.Footer, plus styling for sizes (xs–xl, fullScreen), partitionedFooter / plain variants, loading overlay, configurable shouldCloseOn, focus refs, and stacked-dialog visuals (nested offset, non-cumulative backdrops). It is exported from the package and documented via a changeset and Ladle stories.

Button now allows aria-label as an alternative to tooltip/children (for icon-only close). SharedInputProps.autoFocus is simplified to boolean only; base-input drops the unused data-no-autofocus attribute.

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[augmentcode]

🤖 Augment PR Summary

Summary: Adds a new Dialog component to the HASH design system, built on Ark UI and styled via Panda recipes.

Changes:

• Introduced Dialog wrapper component with structured/custom header support, footer action areas, and optional loading overlay
• Added Dialog sva recipe with slot styling, size variants, and header/padding variants
• Added Ladle stories covering common configurations, sizing, overflow behavior, stacking, and close behaviors
• Updated Button prop requirements to allow aria-label to satisfy the “must provide accessible content” constraint
• Simplified shared input autoFocus typing and removed a data-no-autofocus attribute from BaseInput

Technical Notes: Dialog uses the portal container context so portalled content inherits scoped theme variables; close interactions are configured via shouldCloseOn.

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[augmentcode]

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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