Registry improvements:
- Add checkbox column for selecting animals in the table
- Add selection toolbar with count display
- Add Actions dropdown (Move, Add Tag, Update Attributes, Record Outcome)
- Selection persists across infinite scroll via JavaScript
- Navigate to action page with filter=animal_id:X|Y|Z for selected animals
Event detail improvements:
- Show more animal details: sex (M/F/?), life stage, location name
- Add "Show all X animals" button when >20 animals affected
- HTMX endpoint to load full list on demand
- Separate affected_animals_list component for HTMX swaps
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>