Add VHS glitch animation to vaporwave theme cards

- Periodic jitter, red/cyan title split, and a tracking band sweep on
  each card for a few hundred ms every cycle
- Stagger three phases (10s/13s/17s) with offsets so the board flickers
  organically instead of in lockstep
- Gate with :not(.opacity-50) so dnd-kit's inline transform isn't overridden
  by the animation while a card is being dragged

app/globals.css

@@ -1710,6 +1710,133 @@ html.theme-vaporwave .vw-palm--right-small {
   transform: scaleX(-1);
 }
 
+/* VHS hiccup: every so often a card drops out of the signal for half a
+   second -- a 1-2px jitter, a red/cyan split on the title, and a tracking
+   band sweeping down the panel, all inside one short window (the first 5%
+   of each cycle). Cards run three alternating phases with different periods
+   and offsets, so the board flickers organically instead of in lockstep.
+   The :not(.opacity-50) guard matters: while dnd-kit drives a drag it sets
+   an inline `transform` on the card, and a running animation would override
+   that inline value (animations sit above inline styles in the cascade) --
+   the card stops following the pointer. opacity-50 is exactly the class the
+   card gets while dragging, so the hiccup stands down for the duration.
+   (overflow: hidden keeps the tracking band clipped to the card while it
+   sweeps; the hover lift uses the separate `translate` property, so the
+   jitter doesn't fight it.) */
+html.theme-vaporwave [data-group-card]:not(.opacity-50) {
+  overflow: hidden;
+  animation: vw-card-glitch 10s linear infinite;
+}
+html.theme-vaporwave [data-group-card]:not(.opacity-50) > div:first-child h3 {
+  animation: vw-title-glitch 10s linear infinite;
+}
+html.theme-vaporwave [data-group-card]:not(.opacity-50)::after {
+  content: "";
+  position: absolute;
+  left: 0;
+  right: 0;
+  top: -12%;
+  height: 12px;
+  opacity: 0;
+  pointer-events: none;
+  background:
+    repeating-linear-gradient(0deg, oklch(0.45 0.15 330 / 0.28) 0 1px, transparent 1px 3px),
+    linear-gradient(
+      180deg,
+      transparent 0%,
+      oklch(0.72 0.2 350 / 0.22) 20%,
+      oklch(0.99 0.01 220 / 0.4) 50%,
+      oklch(0.78 0.15 200 / 0.22) 80%,
+      transparent 100%
+    );
+  animation: vw-tracking 10s linear infinite;
+}
+/* Phase B: a longer period and an offset start, so neighbors don't hiccup
+   together. (Static styles above are the idle state -- before a card's
+   first delay elapses, and under reduced motion, everything just sits still.) */
+html.theme-vaporwave [data-category-lane] .overflow-y-auto > div:nth-child(3n + 2) [data-group-card]:not(.opacity-50),
+html.theme-vaporwave [data-category-lane] .overflow-y-auto > div:nth-child(3n + 2) [data-group-card]:not(.opacity-50) > div:first-child h3,
+html.theme-vaporwave [data-category-lane] .overflow-y-auto > div:nth-child(3n + 2) [data-group-card]:not(.opacity-50)::after {
+  animation-duration: 13s;
+  animation-delay: 3s;
+}
+/* Phase C: the longest period, offset furthest. */
+html.theme-vaporwave [data-category-lane] .overflow-y-auto > div:nth-child(3n) [data-group-card]:not(.opacity-50),
+html.theme-vaporwave [data-category-lane] .overflow-y-auto > div:nth-child(3n) [data-group-card]:not(.opacity-50) > div:first-child h3,
+html.theme-vaporwave [data-category-lane] .overflow-y-auto > div:nth-child(3n) [data-group-card]:not(.opacity-50)::after {
+  animation-duration: 17s;
+  animation-delay: 7s;
+}
+@keyframes vw-card-glitch {
+  0%,
+  5%,
+  100% {
+    transform: translateX(0);
+  }
+  0.8% {
+    transform: translateX(-1.5px);
+  }
+  1.6% {
+    transform: translateX(-1.5px);
+  }
+  2.4% {
+    transform: translateX(1px);
+  }
+  3.2% {
+    transform: translateX(1px);
+  }
+  4% {
+    transform: translateX(-0.75px);
+  }
+  4.6% {
+    transform: translateX(0.5px);
+  }
+}
+@keyframes vw-title-glitch {
+  0%,
+  5%,
+  100% {
+    text-shadow: none;
+  }
+  0.8% {
+    text-shadow:
+      1.5px 0 oklch(0.68 0.2 350 / 0.55),
+      -1.5px 0 oklch(0.85 0.15 200 / 0.55);
+  }
+  1.6% {
+    text-shadow:
+      -1.5px 0 oklch(0.68 0.2 350 / 0.55),
+      1.5px 0 oklch(0.85 0.15 200 / 0.55);
+  }
+  2.4% {
+    text-shadow:
+      1px 0 oklch(0.68 0.2 350 / 0.55),
+      -1px 0 oklch(0.85 0.15 200 / 0.55);
+  }
+  3.2% {
+    text-shadow:
+      -0.5px 0 oklch(0.68 0.2 350 / 0.55),
+      0.5px 0 oklch(0.85 0.15 200 / 0.55);
+  }
+}
+@keyframes vw-tracking {
+  0% {
+    top: -12%;
+    opacity: 0;
+  }
+  0.8% {
+    opacity: 0.85;
+  }
+  4.8% {
+    opacity: 0.85;
+  }
+  5%,
+  100% {
+    top: 112%;
+    opacity: 0;
+  }
+}
+
 /* Primary blooms with a soft magenta glow; focus glows electric cyan. */
 html.theme-vaporwave .bg-primary {
   box-shadow: 0 4px 18px oklch(0.62 0.25 350 / 0.35);