feat: implement initial language resolution for SSR and local storage support

- Added a function to determine the initial language based on server-side rendering and local storage.
- Updated i18n initialization to use the resolved initial language instead of the default.

src/components/layout/player-app-shell.tsx

@@ -20,7 +20,7 @@ export function PlayerAppShell({ children }: PlayerAppShellProps): ReactNode {
   return (
     <div className="min-h-dvh bg-white text-foreground">
       <NetworkStatusBanner />
-      <main className="mx-auto flex w-full max-w-lg flex-col pb-[calc(3.5rem+env(safe-area-inset-bottom,0px)+0.75rem)]">
+      <main className="flex w-full flex-col pb-[calc(3.5rem+env(safe-area-inset-bottom,0px)+0.75rem)]">
         {children}
       </main>
       <PlayerBottomNav />