feat: videos page

[wackerow]

Summary

Adds /videos gallery with individual /videos/[slug] pages for viewing, containing video transcripts

Extension of original work in:

• Video gallery feature, watch pages, embeds, and data layer  #17602

Data layer

• Moved all video metadata from videos.json into markdown frontmatter (index.md)
• Renamed transcript.md to index.md for each video
• Rewrote data layer to read from filesystem instead of JSON
• Added VideoFrontmatter type, replaced old Video/VideoMeta/VideoWithMeta types
• Deleted videos.json and videoTranscripts.ts (merged into videos.ts)
• Added breadcrumb frontmatter to all 42 videos
• Used shared stripMarkdown instead of duplicate stripMdx

Components and organization

• Moved page-scoped components out of src/components/ into app/[locale]/videos/_components/
• Inlined transcript accordion and markdown rendering directly into page.tsx
• Moved VIDEO_CATEGORIES to colocated constants.ts, getVideosByCategory to utils.ts
• Updated VideoWatch shared component for new data layer
• Cleaned up unused i18n keys
• Removed PR-added unit and e2e tests

SEO preserved

• JSON-LD VideoObject schema on every video detail page
• Transcript text stays in DOM when accordion is closed via forceMount
• generateStaticParams pre-renders all video pages at build time
• Per-video generateMetadata for title and description meta tags
• Breadcrumbs with translatable labels
• Sitemap inclusion for video pages
• Semantic HTML structure

Preview links

• https://deploy-preview-17970.ethereum.it/nft
• https://deploy-preview-17970.ethereum.it/videos
• https://deploy-preview-17970.ethereum.it/videos/privacy-is-existential/

Schema Markup Validator

• https://validator.schema.org/#url=https%3A%2F%2Fdeploy-preview-17970.ethereum.it%2Fvideos
• https://validator.schema.org/#url=https%3A%2F%2Fdeploy-preview-17970.ethereum.it%2Fvideos%2Fprivacy-is-existential%2F

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Note: Recovers PR #17870 which was reverted after being merged prior to passing necessary checks.

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