- Add ItemDetailModal component for viewing item details and replacing photos
- Add photo replacement/deletion endpoints to API layer (PUT/DELETE /items/{id}/photo)
- Update InventoryTable to open detail modal on item click
- Show current photo thumbnail with Replace/Delete buttons
- Support uploading new photo with ItemPhotoUpload component
- Delete old photo on backend when replacing (no orphaned files)
- Full test coverage: 18 tests for ItemDetailModal component
- All 393 tests passing, zero TypeScript errors
- Build verified successfully