fix default theme icon

src/components/ui/themeSwitcher/ThemeSwitcher.jsx

@@ -8,7 +8,9 @@ export default function ThemeSwitcher() {
     const [theme, setTheme] = useState("");
 
     useEffect(() => {
-        setTheme(localStorage.getItem("theme"));
+        const t = localStorage.getItem("theme");
+        if(t) setTheme(t);
+        else setTheme("light");
     }, []);
 
     const switchTheme = () => {