Fix admin regressions from Biome refactor: theme init, mobile nav, i18n.

Restore valid browser JS in theme-init, close mobile sidebar on navigation, and split autoDjForm title/trackTitle across locales.

Co-authored-by: Cursor <[email protected]>

public/scripts/theme-init.js

@@ -1,8 +1,8 @@
 (() => {
-	let theme: string | null = null;
+	let theme = null;
 	let defaultDark = false;
-	let navbarColor: string | null = null;
-	let navbarTextColor: string | null = null;
+	let navbarColor = null;
+	let navbarTextColor = null;
 	try {
 		theme = localStorage.getItem("theme");
 		const dd = document.querySelector('meta[name="theme-default-dark"]');