Night Drive: Kavinsky-esque synthwave preset + gradual smear glitches

Glitches are now smears, not jumps: the render script ramps chromashift on a sine envelope via stepped sendcmd (one smear spanning every section fade, slow random tape damage between); the browser layer eases filter/transform over ~1-1.7s with a drifting tear band.

• render-sample-video.js refactored into presets (argv picks one): vaporwave -> sample.mp4 (unchanged song/footage) synthwave -> synthwave.mp4 (new, moody)

• The synthwave song: 92bpm B minor i-VI-III-VII, octave-pulse saw bass that never changes gear, halftime verses into four-on-floor choruses, sparse square lead (updown in choruses), dark low-cutoff pads…

▶ Play it: Highway Heat Death → Food Court Eternity — a shuttle between the two genres this change names — the blend is the point https://stellate.app/?genre=synthwave&seed=8190&path=859.9931,1679.4415&xdur=0.134

2b0c155 https://github.com/aboard-io/stellate/commit/2b0c155e39411d041975fceb12cac599c472b792