Fix theme to dark and hide the theme switch in the share template

templates/share/page.ejs

@@ -69,13 +69,11 @@
         const openGraphDomain = subRoot.note.getLabelValue("shareOpenGraphDomain");
     %>
     <title><%= pageTitle %></title>
+    <style>#site-header .theme-selection{display:none}</style>
     <% if (pageUrl) { %><link rel="canonical" href="<%= pageUrl %>"><% } %>
     <script>
-        // Load dark/light theme as soon as possible to avoid color flashes.
-        let theme = localStorage.getItem("theme");
-        if (!theme) {
-            theme = window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches ? "dark" : "light";
-        }
+        // Theme is fixed to dark – light/dark switching is disabled.
+        const theme = "dark";
         document.documentElement.classList.add(`theme-${theme}`);
 
         window.glob = {