refactor: convert logical operator to optional chainining (#11033)

The [optional chaining](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining) operator can be used to perform null checks before accessing a property, or calling a function.

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

ui/nx-monorepo/packages/ui-kit/src/ui/ToggleDarkMode/ToggleDarkMode.tsx

@@ -31,7 +31,7 @@ export const ToggleDarkMode: React.FC<ToggleDarkModeProps> = ({
     setDarkMode(!darkMode)
     const newTheme = darkMode ? 'light' : 'dark'
     setTheme(newTheme)
-    onChange && onChange(newTheme)
+    onChange?.(newTheme)
   }
 
   if (!mounted) return null