fix: decode URL-encoded hash fragment before getElementById lookup

Anchors with special characters (e.g. spaces encoded as %20) would fail
the getElementById lookup because the raw URL-encoded string doesn't
match the element's id attribute. Apply decodeURIComponent() with a
try/catch fallback to handle malformed URIs gracefully.

docs/safari-anchor-fix.js

@@ -12,7 +12,13 @@
     var hash = window.location.hash;
     if (!hash) return;
 
-    var id = hash.substring(1);
+    var rawId = hash.substring(1);
+    var id;
+    try {
+      id = decodeURIComponent(rawId);
+    } catch (e) {
+      id = rawId;
+    }
     var el = document.getElementById(id);
     if (el) {
       el.scrollIntoView();