Eight named scenes chained by all seven transition kinds.
Each scene is a full-canvas color with its label centred. Transitions sit on the
composition itself, not on individual sequences — they reference siblings by name.
crossfade — alpha cross-dissolvewipe — soft directional reveal (shader mask)iris — circular reveal from / to a pointslide — both sequences move together; new scene comes from the opposite sidedip — A fades out, then B fades in; whatever is behind shows throughzoom — punch-in / punch-out scale + fadedissolve — Perlin-noise pixel reveal, deterministic by seed