feat(ui): improve Amiibo selection UX
Improve the Amiibo selection UX by making the following changes:
- If no series selected, display all available amiibos
- Display Amiibos in a list in a dock on the left side, with the image of the selected one on the right, instead of a dropdown selector
- Improve the "Only Amiibos available for this game" message clarity to make it more intuitive