- Add ErrAnchorRequired sentinel to pkg/album — replaces fragile string equality check
used for 422 detection; callers now use errors.Is()
- Extract parseShotIndex() helper in album handler — replaces fmt.Sscanf which silently
accepted partial parses like "12abc"; strconv.Atoi requires the full string to be numeric
- Restructure caption saves in album/handler — captions now written outside the
len(img.Data) > 0 gate, so URL-only providers (no bytes returned) still get captions
- Add storage.FetchURL() shared utility — removes fetchBytes/downloadURL duplication
across album and generation packages; callers control timeout via their http.Client
- Add video captions to VideoHandler — same caption sidecar pattern applied to videos
- Add persona generation event types to realtime package — persona_spec_*, persona_image_*,
persona_video_* events added to EventType union and usePersonaGeneration hook exported
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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