Bulk delete of Game Kit Controller content: removes many demo models, animations, textures, materials, prefabs, particle/terrain assets and a large set of inventory capture images. This is a cleanup to remove third-party/demo art and large binary assets from the repository (no code changes).
Import two UI audio packs (Casual Game Sounds U6 and Free UI Click Sound Effects Pack) including dozens of .wav files, metadata, license/artwork and documentation. Add TextMesh Pro resources and new fonts (KOMIKAX and LiberationSans) and associated materials. Update MainMenu UI (MainMenu.uxml), its controller (MainMenuController.cs), panel settings asset and refresh MainMenu and SampleScene unity scenes to use the new assets.
