- Location model: plants now FK to Location instead of free-text CharField
- Data migration 0004 converts existing location strings to Location objects
- PlantForm uses ModelChoiceField dropdown + inline "add new location" text field
- PlantPhoto model: multiple photos per plant with is_thumbnail flag
- Plant.thumbnail_url property: picks marked thumbnail, falls back to first photo then legacy photo field
- Photo gallery partial: upload, set thumbnail (★), delete (✕) with HTMX swaps on #photo-gallery
- plant_detail: uses thumbnail_url for hero image, pruning history section removed
- plant_list search updated: location__name__icontains instead of location__icontains
- Three new URL routes: upload_photo, set_thumbnail, delete_photo
- All 53 tests updated and passing
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
