feat(quoi-de-neuf): mise en avant de la page quoi de neuf.

[m-maillot]

closes #7137

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[revu-bot]

PR Summary: feat(quoi-de-neuf) — Mise en avant de la page "Quoi de neuf"

This PR promotes the "Quoi de neuf" page by:

1. Adding a WhatsNewLink sidebar component displayed on convention collective pages.
2. Replacing the "Glossaire" footer link with the "Quoi de neuf" link.
3. Extending ContainerRich and ContainerRichWithBreadcrumbs with an opt-in showWhatsNewLink prop.

The implementation is straightforward and low-risk. A few issues worth addressing:

File	Lines	Severity	Issue
whatsnew/index.tsx	7	IMPORTANT	Variable p used before declaration (hoisting risk + readability)
whatsnew/index.tsx	8–9	IMPORTANT	Wrong DSFR icon class applied via fr.cx — icon tokens are not utility classes
AgreementContainer.tsx	36	MINOR	Redundant boolean literal showWhatsNewLink={true}
FooterTop.tsx	10–13	IMPORTANT	"Glossaire" link removed with no redirect — existing users/bookmarks will hit a 404

[tokenbureau]

🎉 Deployment for commit 2f234a2 :

Ingresses

• 🚀 https://code-du-travail-numerique-feat-whats-new-highlight-194id034.ovh.fabrique.social.gouv.fr/

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• 📦 docker pull harbor.fabrique.social.gouv.fr/cdtn/code-du-travail-numerique/app:sha-2f234a2c6c3cfe780156e914c6c5b9e649f4705f

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