enh: electron window focus detect

src/lib/components/app/AppControls.svelte

@@ -2,7 +2,7 @@
 	import Tooltip from '$lib/components/common/Tooltip.svelte';
 	import Plus from '$lib/components/icons/Plus.svelte';
 
-	let selected = 'home';
+	let selected = '';
 </script>
 
 <div class="min-w-[4.5rem] bg-gray-50 dark:bg-gray-950 flex gap-2.5 flex-col pt-10">