Scenes were seeded with just a scene_color_svg swatch — content.scenes.image /
snapshot_url were empty, so the studio/admin scene previews showed swatches, not
the actual scene. Now every scene gets a real rendered image:
- single-scene templates → their per-aspect thumbnail;
- multi-scene templates → one still per scene, captured at that scene's own frame.
Adds the 39 CharacterStory per-scene stills (13 scenes × 3 aspects), each rendered
at (sceneIndex*90 + 45). LogoMotion3D's single scene now points at its thumbnail.
Verified: DB image/snapshot_url populated, all per-scene images serve 200, and the
stills are distinct per scene (c7 = «یک مانع», kicker ۰۷/۱۳).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
soroush.asadi
