perf(UI): improved visibility of explore bar tooltips

src/renderer/scss/main.scss

@@ -264,6 +264,12 @@ option:checked {
   border: none;
 }
 
+.tooltip:hover {
+  &::after {
+    opacity: 1;
+  }
+}
+
 .badge {
   &[data-badge],
   &:not([data-badge]) {

src/renderer/scss/themes/light-theme.scss

@@ -222,6 +222,10 @@
 
         .table-size {
           opacity: 0.4;
+          
+          &:hover {
+            opacity: 1;
+          }
         }
       }
     }