More updates everywhere related to TW v4

src/routes/+layout.svelte

@@ -381,6 +381,11 @@ if ($ae_loc?.site_access_key || $ae_loc?.site_domain_access_key) {
 // Root Svelte Layout Specific:
 let trigger_clear_access: null|boolean = $state(null);
 
+if (browser) {
+    document.documentElement.setAttribute('data-theme', $ae_loc?.theme_name ?? 'nouveau');
+    // cerberus
+}
+
 // $effect(() => {
 if (browser && flag_reload) {
     if (log_lvl) {