WS-2003: Portrait Carousel on Live Pages

[HarveyPeachey]

Resolves JIRA: https://bbc.atlassian.net/browse/WS-2003

Summary

Adds PV carousel onto live pages when found in page data

Code changes

• Adds PV carousel to second section before stream
• Makes PV carousel title optional
• Adds logic to only render title when prop exists
• Removes flex styling from second section (Don't think it's needed?)
• Fixes a small naming bug with overflowWrap, (whilst I was here)

Testing

1. List the steps required to test this PR.

Useful Links

• Coding Standards
• Repository use guidelines
• Add Links to useful resources related to this PR if applicable.

[HarveyPeachey]

Will get UX to take a look to see if the number of promos is suitable for the container size

[Copilot]

Pull request overview

Adds support for rendering the Portrait Video (PV) carousel on Next.js live pages when portrait video items are present in the live page payload, and updates the shared PortraitVideoCarousel component to allow omission of a visible title.

Changes:

• Render PortraitVideoCarousel on live pages (in the second section, before the stream) when portraitVideoItems exist.
• Make the carousel title optional and only render the heading when a title is provided.
• Update live page styling and tests; fix overflowWrap naming in live label header styles.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
ws-nextjs-app/pages/[service]/live/[id]/styles.ts	Removes flex centering from the live page second section to accommodate the new carousel + stream layout.
ws-nextjs-app/pages/[service]/live/[id]/LivePageLayout.tsx	Adds conditional live-page rendering of PortraitVideoCarousel using portraitVideoItems.
ws-nextjs-app/pages/[service]/live/[id]/live.test.tsx	Mocks and asserts carousel rendering when portraitVideoItems are provided.
ws-nextjs-app/pages/[service]/live/[id]/Header/LiveLabelHeader/index.styles.ts	Fixes overflowWrap style key naming.
src/app/components/PortraitVideoCarousel/index.tsx	Makes title optional; conditionally renders heading; introduces aria-label fallback.
src/app/components/PortraitVideoCarousel/index.test.tsx	Adds a test for rendering the carousel without a title.