fix: robust multi-client YouTube transcript provider#64
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Replace the single-client (Android-only) InnerTube transcript fetcher with a multi-client fallback chain: Android → Web → iOS. When YouTube blocks one client identity (bot detection, rate limiting), the provider automatically tries the next. Also adds EU cookie consent handling and typed error codes for better debugging. Fixes transcript fetching failures reported by users on 2026-04-01. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
SamuelZ12
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fix/robust-transcript-provider - longcut PR #64
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Summary
BOT_DETECTED,IP_BLOCKED,TRANSCRIPTS_DISABLED, etc.) for better debuggingWhy
Users reported "No transcript available" errors starting 2026-04-01. The current single-client approach is getting blocked by YouTube's bot detection on Vercel's datacenter IPs. The multi-client fallback makes this significantly more resilient.
Test plan
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