♿️(frontend) fix share modal heading hierarchy and title

[Ovgodd]

Purpose

Fix two accessibility issues in the share modal:

1. The modal's accessible name was [object Object] and there was a duplicate role="dialog" causing confusion for screen readers.
2. The heading hierarchy was inconsistent: group names and "Link settings" were not structured as h2 under the h1 "Share the document", and some were hidden from assistive technologies via aria-hidden.

Proposal

• Fix modal aria-label being [object Object] by passing an explicit string instead of relying on title.toString() on a ReactNode
• Remove duplicate role="dialog" and aria-label from the inner presentational container
• Replace the heading prop of Command.Group (which rendered a div with aria-hidden="true") with an explicit <Text as="h2"> for group names (e.g. Shared with X users, Document owner, Pending invitations)
• Render "Link settings" as h2 in DocVisibility
• Ensure consistent h1 → h2 heading hierarchy in the share modal

[github-actions]

Size Change: +14 B (0%)

Total Size: 4.23 MB

Filename	Size	Change
apps/impress/out/_next/static/aa91a702/_buildManifest.js	902 B	+902 B (new file)	🆕
apps/impress/out/_next/static/c64a2035/_buildManifest.js	0 B	-902 B (removed)	🏆

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[AntoLC]

Under Unreleased.