enhance(ui): refs link

src/main/frontend/common.css

@@ -468,11 +468,21 @@ a.tag {
   @apply text-sm inline-flex items-center text-center cursor-pointer rounded opacity-70;
 
   color: var(--lx-accent-11, var(--ls-tag-text-color, hsl(var(--primary))));
+
+  &:hover {
+    opacity: var(--ls-tag-text-hover-opacity, 1);
+    text-decoration: underline;
+  }
+
+  &[data-ref] + &[data-ref] {
+    @apply mx-[3px];
+  }
 }
 
-a.tag:hover {
-  opacity: var(--ls-tag-text-hover-opacity, 1);
-  text-decoration: underline;
+.preview-ref-link {
+  & + &, & + a.tag, a.tag + & {
+    @apply mx-[3px];
+  }
 }
 
 svg.note {

src/main/frontend/components/block.cljs

@@ -691,7 +691,7 @@
             (shui/popup-hide!))))
       [visible?])
 
-    [:span
+    [:span.preview-ref-link
      {:ref *el-trigger
       :on-mouse-enter (fn []
                         (let [timer (rum/deref *timer)