feat(marquee): cross-fade flicker — next tag lights before previous fades out

public/css/main.css

@@ -5537,10 +5537,10 @@ body.content-edit-shift-active.content-edit-mode-active .content-edit-fab-stack
 
 @keyframes tagFlicker {
   0%   { opacity: 1; }
-  8%   { opacity: 1; }
-  10%  { opacity: 0.2; }
-  90%  { opacity: 0.2; }
-  92%  { opacity: 1; }
+  4%   { opacity: 1; }
+  13%  { opacity: 0.2; }
+  87%  { opacity: 0.2; }
+  96%  { opacity: 1; }
   100% { opacity: 1; }
 }