[BUG FIX] [MER-5780] Add accessible titles and descriptions to adaptive iframes

[kjsegovi]

This is a fix for MER-5780. I am adding an aria label to the iframe component in Advanced Author and Simple Author. The previously set description should also still be available and continue being announced.

• Adds a separate, editable Title field to the iframe component in Simple Author and Advanced Author.
• Defaults missing or blank iframe titles to Embedded content, including existing content.
• Preserves the existing Description field and uses it as the iframe’s accessible description.
• Associates descriptions through a dedicated aria-describedby target.
• Removes the redundant aria-label and the previous container-level description association that caused repeated and unrelated screen-reader announcements.
• Requires no content or database migration.

Testing

Automated

• 43 related Jest tests pass.
• TypeScript check passes.
• ESLint passes.
• Prettier passes.
• Git diff check passes.

Manual

Verified in authoring and delivery that:

• Title and Description are separate editable fields.
• Custom values persist after saving and refreshing.
• Existing iframe descriptions remain available.
• Missing titles use Embedded content.
• Empty descriptions do not add aria-describedby.
• VoiceOver announces the title once, followed by the description.
• Surrounding screen titles are no longer included in the iframe announcement.
• External iframe content continues to load and scroll normally.

[github-actions]

Risk score: 2 → risk/low

Generated by 🚫 dangerJS against c787acc

[github-actions]

AI Review — security

No issues found

[github-actions]

AI Review — ui

Preserve the description fallback

file: assets/src/components/parts/janus-capi-iframe/ExternalActivity.tsx
line: 1229
Description: The previous implementation fell back to description when formattedDescription was empty. Resolving only formattedDescription can now omit accessible context despite a model description being available.
Suggestion: Use resolveIframeDescription(formattedDescription || description).

[github-actions]

AI Review — typescript

No issues found