Add dramatic NIP-62 Request to Vanish display (kind 62)

Implement a visually striking display for kind 62 vanish events with
animated caution stripes, glitch effects, and a grand exit aesthetic.
Since the user has nuked their account, the npub is shown instead of
profile info. Supports both compact feed cards and full detail view
with comments and sharing.

src/index.css

@@ -164,4 +164,93 @@
   animation: landing-hero-fade-in 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
 }
 
+/* ── NIP-62 Request to Vanish ───────────────────────────────────────────────── */
+
+/* Animated caution stripes — red/dark diagonal bands that scroll */
+.vanish-stripes {
+  background: repeating-linear-gradient(
+    -45deg,
+    hsl(0 72% 51% / 0.7),
+    hsl(0 72% 51% / 0.7) 10px,
+    hsl(0 72% 51% / 0.25) 10px,
+    hsl(0 72% 51% / 0.25) 20px
+  );
+  background-size: 28.28px 28.28px;
+  animation: vanish-stripe-scroll 1.5s linear infinite;
+}
+
+:is(.dark) .vanish-stripes {
+  background: repeating-linear-gradient(
+    -45deg,
+    hsl(0 72% 51% / 0.6),
+    hsl(0 72% 51% / 0.6) 10px,
+    hsl(0 72% 51% / 0.15) 10px,
+    hsl(0 72% 51% / 0.15) 20px
+  );
+  background-size: 28.28px 28.28px;
+  animation: vanish-stripe-scroll 1.5s linear infinite;
+}
+
+@keyframes vanish-stripe-scroll {
+  from { background-position: 0 0; }
+  to { background-position: 28.28px 0; }
+}
+
+/* Glitch text effect on the /// symbol */
+.vanish-glitch-text {
+  position: relative;
+  animation: vanish-glitch 3s ease-in-out infinite;
+}
+
+@keyframes vanish-glitch {
+  0%, 90%, 100% { opacity: 1; transform: translate(0); }
+  92% { opacity: 0.8; transform: translate(-2px, 1px); }
+  94% { opacity: 0.6; transform: translate(2px, -1px); }
+  96% { opacity: 0.9; transform: translate(-1px, -1px); }
+  98% { opacity: 1; transform: translate(1px, 0); }
+}
+
+/* Ring pulse animation for the icon */
+.vanish-ring-pulse {
+  animation: vanish-ring 3s ease-out infinite;
+}
+
+.vanish-ring-pulse-delayed {
+  animation: vanish-ring 3s ease-out 1.5s infinite;
+}
+
+@keyframes vanish-ring {
+  0% { transform: scale(1); opacity: 0.4; }
+  50% { transform: scale(1.15); opacity: 0; }
+  100% { transform: scale(1); opacity: 0; }
+}
+
+/* Slow blink for the status dot */
+.vanish-blink {
+  animation: vanish-blink-kf 2s ease-in-out infinite;
+}
+
+@keyframes vanish-blink-kf {
+  0%, 40%, 100% { opacity: 1; }
+  50%, 90% { opacity: 0.2; }
+}
+
+/* Reduced motion: disable all vanish animations */
+@media (prefers-reduced-motion: reduce) {
+  .vanish-stripes {
+    animation: none;
+  }
+  .vanish-glitch-text {
+    animation: none;
+  }
+  .vanish-ring-pulse,
+  .vanish-ring-pulse-delayed {
+    animation: none;
+    opacity: 0;
+  }
+  .vanish-blink {
+    animation: none;
+  }
+}
+