Let the riddim wobble drive the liquid drop and bring back its texture

Two new features follow the bass line itself: its envelope against the last moment,
which rises and falls with every wub, and how open its filter is (spectral centroid
of the bass and mids). Each wub swells the drop, and as the filter opens its surface
crinkles and spikes like before. Every layer keeps a floor, so the drop never goes
still and nothing snaps in from nothing; riddim gets its soft terraces back. Kicks
still make it jump.

web/src/style.css

@@ -257,9 +257,9 @@ button.danger:not(.link) { background: var(--accent); border: none; color: #fff;
 /* The liquid drop spills past the art slot; taps go through it to the card. */
 .liquid-canvas {
   position: absolute;
-  inset: -40%;
-  width: 180%;
-  height: 180%;
+  inset: -50%;
+  width: 200%;
+  height: 200%;
   pointer-events: none;
 }
 .card.liquid .art { background-image: none !important; background-color: transparent; box-shadow: none; scale: 1; }