feat: implement osu! installation path input in Launch.svelte, and enhance loading animation cleanup

src/app.html

@@ -4,7 +4,7 @@
 <head>
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1" />
-  <title>Tauri + SvelteKit + Typescript App</title>
+  <title>EZPPLauncher</title>
   %sveltekit.head%
 </head>