Video-in-sky: wrap the footage around the planet as a glowing atmosphere

Refine v26's sky-video from a flat billboard screen behind the band into an ATMOSPHERE (Paul: "the video should be mapped around the planet like its atmosphere").

Verified: full-boot, starcruise-run + nav.

▶ Play it: Rail Replacement Rapture — a bed-heavy genre where the found-sound layer carries the room https://stellate.app/?genre=transitwave&seed=9063&path=749.12536,768.12569,730.12569&xdur=13.122

eb7851f https://github.com/aboard-io/stellate/commit/eb7851f723375f5bede0aa5095fed29e961d2ee2