feat: YouTube transcripts library UI

[Krasimir-Hristov]

• VideoTranscriptCard: title/channel/duration/summary (expandable)/key points/delete dialog
• VideoLibrary: grid layout with skeleton loading and empty state
• useYoutube: user-scoped TanStack Query hooks (useVideoTranscripts, useDeleteTranscript)
• api.ts: listVideoTranscripts + deleteVideoTranscript (Zod UUID validation)
• /youtube page with back-to-chat header
• ChatWindow: Video icon link to /youtube in toolbar

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 0e698614-4122-48d7-8ec2-ee6dccb4de7c

📥 Commits

Reviewing files that changed from the base of the PR and between c9c769f and 0b9cb62.

📒 Files selected for processing (7)

• frontend/app/(dashboard)/youtube/page.tsx
• frontend/features/chat/components/ChatWindow.tsx
• frontend/features/youtube/components/VideoLibrary.tsx
• frontend/features/youtube/components/VideoTranscriptCard.tsx
• frontend/features/youtube/hooks/useYoutube.ts
• frontend/features/youtube/types.ts
• frontend/lib/api.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/youtube-transcripts-ui

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[Krasimir-Hristov]

@copilot