A skate crew is defined by its footage. Crews can now feature a headline video:
- videoEmbed.ts: safe parser accepting ONLY YouTube and Instagram URLs (full
parts on YT, clips on IG). Extracts video id / shortcode; rejects everything
else so we never render an untrusted iframe. No native/self-hosted video.
- CrewVideoSection ("The Part"): cinematic section — YouTube click-to-load
facade (poster + play button, no heavy iframe/cookies until play) and an
Instagram permalink embed, framed with skate language.
- SkateCrew gains `videoUrl` (tag `video`), validated through the embed parser.
- CrewForm: "The Part" input with live source detection (YouTube/Instagram) and
validation; publishes the `video` tag.
- Crews grid: crews with footage flex a "▶ Part" badge as a discovery signal.
- NIP.md: document the `video` tag (YouTube/Instagram only) + example.
Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>
