feat(mobile-expo): MediaCollectionRenderer section component

[up-tandem]

Summary

• Replaces the MediaCollection stub with a full renderer supporting all 5 layout variants
• carousel: horizontal ScrollView of item cards
• collection: vertical list of items
• grid: 2-column FlatList layout
• hero / player: single prominent featured item
• Shared MediaItemCard sub-component with thumbnail (from imageOverride or video.image), title (titleOverride or video.title), subtitle, item number overlay (when showItemNumbers is true), and collection size badge
• Header renders categoryLabel, title, subtitle, description (all optional)
• Optional ctaLink and footerText at bottom
• Empty items array handled gracefully
• Accessible labels on items and CTA

Contracts Changed

No

Regeneration Required

No

Validation

• pnpm --filter @forge/expo lint — passes with 0 warnings
• pnpm --filter @forge/expo test -- --testPathPattern=MediaCollectionRenderer — 9/9 tests pass
• pnpm --filter @forge/expo test -- --testPathPattern=SectionDispatcher — 11/11 tests pass (no regressions)

Resolves #313

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 022c544f-8c6c-453b-b7a1-069f8eedada9

📥 Commits

Reviewing files that changed from the base of the PR and between 2bc0bcd and 78263d9.

📒 Files selected for processing (5)

• mobile/expo/src/components/sections/MediaCollectionRenderer.test.tsx
• mobile/expo/src/components/sections/MediaCollectionRenderer.tsx
• mobile/expo/src/components/sections/MediaCollectionStub.tsx
• mobile/expo/src/components/sections/SectionDispatcher.tsx
• mobile/expo/src/components/sections/index.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/313-media-collection-renderer

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