feat(effects): polish 8 effects and add 7 new engines with parallax

Synthwave, fireflies, snow, sakura, nebula: CSS/SVG. Matrix and
constellation: canvas. Existing engines gain depth, color, glow, and
parallax (mouse and device tilt, opt-in on iOS)

src/pages/PointsPage.jsx

@@ -180,7 +180,7 @@ function Preview({code}) {
     if (look.effect) {
         return (
             <span ref={ref} className={cn('relative h-8 w-14 shrink-0 overflow-hidden rounded-md bg-background', !inView && 'fx-paused')}>
-                <EffectBackground effect={look.effect} className="absolute inset-0"/>
+                <EffectBackground effect={look.effect} parallax={false} className="absolute inset-0"/>
             </span>
         );
     }