Say "Click to interact." for messages with links

[Eugene (OEvgeny)]

Messages with links never get "Click to interact." in their accessible name.

Changelog Entry

Fixed

• Fixed screen readers not saying "Click to interact." for messages with links, in PR #5927, by @OEvgeny

Description

InteractiveType.LINK is the first enum member (0), so the truthiness check for the footnote treated messages with links as not interactive: they were named "… One or more links in the message." without "Click to interact.". The interactive type is now a string union ('link' | 'widget'), so every type is truthy.

Design

• A string union instead of the numeric enum, so the original truthiness check is correct for any future type. Separate link reference markers from the previous word for screen readers #5923 asserts the current name ("… One or more links in the message.") in accessibleName.linkReference.html: whichever merges second appends " Click to interact." there.

Specific Changes

• useActivityAccessibleName.ts: type InteractiveType = 'link' | 'widget' instead of enum InteractiveType { LINK, WIDGET }
• accessibility/accessibleName.link.html: a plain message has no footnote, a message with a link ends with "One or more links in the message. Click to interact." (state only, no snapshots)

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)