fix: update TOC handling logic to use showToc flag

layouts/posts/single.html

@@ -9,6 +9,7 @@
   {{- $toc := .Store.Get "toc" -}}
   {{- $tableOfContents := .Fragments.ToHTML ($toc.startlevel | int) ($toc.endlevel | int) ($toc.ordered | default false) -}}
   {{- $showToc := $toc.enable | and (ne $tableOfContents `<nav id="TableOfContents"></nav>`) -}}
+  {{- .Store.Set "showToc" $showToc -}}
   {{- $tableOfContents = dict "Content" $tableOfContents "Ruby" $params.ruby "Fraction" $params.fraction "Fontawesome" $params.fontawesome | partial "function/content.html" | safeHTML -}}
 
   <aside class="aside-collection animate__animated animate__fadeIn animate__faster" aria-label="{{ T "collections" }}">
@@ -234,7 +235,6 @@
 
   {{- /* TOC Dialog */ -}}
   {{- if $showToc -}}
-    {{- .Page.Store.Set "hasToc" true -}}
     <dialog id="toc-dialog" aria-labelledby="toc-dialog-title" role="dialog">
       <div class="toc">
         <h2 class="toc-title">{{ T "single.contents" }}</h2>