Visual refresh, hero banners, and genre pages

Hero banners - all entity detail pages now feature full-width hero banners with entity-coloured gradients, replacing the previous plain headers.

Genre pages - genres have been promoted from simple labels to first-class entities with their own images, detail pages, and admin management. Browse all genres at /genres.

Visual refresh - entity icons replaced with coloured dots throughout the site for a cleaner look. Entity-specific colours now appear in navigation and breadcrumb links.

Admin entity configuration - administrators can now customise header colours and intro text for each entity type's listing page.

Hierarchical lookup values - lookup values now support parent/child relationships (e.g. "Physical Attribute Type > Species") for better data organisation.

Hero banners - all entity detail pages now feature full-width hero banners with entity-coloured gradients, replacing the previous plain headers.

Genre pages - genres have been promoted from simple labels to first-class entities with their own images, detail pages, and admin management. Browse all genres at /genres.

Visual refresh - entity icons replaced with coloured dots throughout the site for a cleaner look. Entity-specific colours now appear in navigation and breadcrumb links.

Admin entity configuration - administrators can now customise header colours and intro text for each entity type's listing page.

Hierarchical lookup values - lookup values now support parent/child relationships (e.g. "Physical Attribute Type > Species") for better data organisation.