feat(marquee): shift flicker so tags fade out by 10% (visible at cycle start)

public/css/main.css

@@ -5535,11 +5535,12 @@ body.content-edit-shift-active.content-edit-mode-active .content-edit-fab-stack
 .marquee-grid__cell:nth-child(15) { animation-delay: -15s; }
 
 @keyframes tagFlicker {
-  0%   { opacity: 0; }
-  2%   { opacity: 1; }
-  16%  { opacity: 1; }
-  18%  { opacity: 0; }
-  100% { opacity: 0; }
+  0%   { opacity: 1; }
+  8%   { opacity: 1; }
+  10%  { opacity: 0; }
+  90%  { opacity: 0; }
+  92%  { opacity: 1; }
+  100% { opacity: 1; }
 }
 
 @media (prefers-reduced-motion: reduce) {