feat: implement article details page with related articles

[Shanidhya01]

PR Description

Implements a production-ready Health Articles feature for the UltimateHealth web platform — a full article detail reading experience and an articles index/listing page, wired into the existing site navigation.

Closes #1015

Changes include:

• src/types/article.ts — TypeScript types for Article, RichContent, and all ContentBlock subtypes (paragraph, heading, callout, list, image, code, divider)
• src/lib/article-data.ts — 5 mock articles with full metadata, getArticleById(), getRelatedArticles() helpers, and 10 default glossary terms
• src/app/articles/page.tsx — Articles index page at /articles with a 3-column responsive card grid
• src/app/articles/[id]/page.tsx — Dynamic article detail page with generateMetadata(), generateStaticParams(), and notFound() support
• src/components/articles/GlossaryProvider.tsx — React context distributing medical glossary terms
• src/components/articles/ReadingProgressBar.tsx — Fixed scroll-progress bar with ARIA progressbar role
• src/components/articles/AccessibilityControls.tsx — Floating font-size panel (sm/md/lg) with TTS/bookmark stubs
• src/components/articles/ArticleBreadcrumbs.tsx — Structured breadcrumb trail using existing Breadcrumb UI
• src/components/articles/ArticleHero.tsx — Hero with Next.js Image, category badge, H1, tags
• src/components/articles/ArticleContent.tsx — Rich content renderer with inline glossary tooltip highlighting
• src/components/articles/RelatedArticles.tsx — Scored related-article suggestions in a responsive grid
• src/components/articles/ArticlePageClient.tsx — Single client boundary composing the full reading page
• src/app/page.tsx — Desktop nav, mobile nav, and footer Quick Links updated to link to /articles

Type of Change

• Bug fix (change which fixes an issue)
• New feature (change which adds functionality)
• Documentation update

Select your work-area

• Frontend
• Backend
• Documentation
• Others

Related Issue

Please provide a link to the issue solved if applicable.

Screenshot

Fixes (mention the issue number which this fixes)

#closes

Checklist

• I have updated my branch and synced it with the project's 'develop' branch before making this PR.
• I have optimized the file changes.
• I have added a snapshot of my work example.
• I have made a PR to the project's develop branch.

Undertaking

• My code follows the style guidelines of this project.

• I have performed a self-review of my code.

• I have commented my code, particularly in hard-to-understand areas.

• I have made corresponding changes to the documentation.

• I have checked for plagiarism and assure its authenticity.

• I have read and followed the code of conduct for this repository. I understand that violation of this undertaking may have legal consequences.

• I Agree

[github-actions]

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