Refactor org web content and simplify shared UI

assets/scripts/ui/toc-active-link.js

@@ -1,11 +1,11 @@
 /* Event listener for scrolling and changing the active label on the TOC */
 document.addEventListener("DOMContentLoaded", () => {
     const toc = document.querySelector("#text-table-of-contents");
-    if (!toc) { console.warn("No #text-table-of-contents found"); return; }
+    if (!toc) return;
 
     const links = toc.querySelectorAll('a[href^="#"]'); // '^=' is a starts with operator.
     // <a href="#introduction">Intro</a>   matches  
-    if (!links.length) { console.warn("No ToC links found"); return; }
+    if (!links.length) return;
 
     // Map: id -> link
     const linkById = new Map();
@@ -14,7 +14,7 @@ document.addEventListener("DOMContentLoaded", () => {
 	const el = document.getElementById(id);
 	if (el) linkById.set(id, a);
     });
-    if (!linkById.size) { console.warn("No matching headings with IDs"); return; }
+    if (!linkById.size) return;
 
     // Headings to observe (h2–h4 usually)
     const headings = [...document.querySelectorAll("h2[id], h3[id], h4[id]")]