Shot Lab's source picker becomes video-first: one query for recent videos
regardless of stream completion (an in-progress recording with no shots
yet still appears), carrying stream recency fields so the client can hint
"actively updating" without gating on it. Operation-only change; schema
is untouched (the stream fields already exist).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
