Replaces the details page’s text-only cast list with a dedicated `CastCarousel` UI component that shows portrait cards, names, and roles in a horizontally scrollable row. It adds previous/next controls, hides the internal scrollbar, and handles horizontal wheel input without breaking vertical page scrolling.
Also adds `tests/test_cast.gd` to cover card rendering, image-tag based portrait loading, navigation button state, wheel behavior, long-text layout safety, and responsive sizing.
Lizzy
1d07bcb46f