Enhance documentation and improve formatting across multiple files

front/css/app.css

@@ -1417,6 +1417,7 @@ textarea[readonly],
     grid-template-columns: repeat(auto-fit, minmax(125px, 1fr));
     gap: 0.75em;
     padding: 0.5em 0;
+    padding-top: 0;
 }
 
 #columnFilters::before,