fix: responsive sidebar backdrop closing on mobile

frontend/src/app.rs

@@ -327,10 +327,10 @@ pub fn App() -> impl IntoView {
                     // MOBILE SIDEBAR
                     <div 
                         class={move || if show_mobile_sidebar.get() { "fixed inset-0 z-50 flex md:hidden" } else { "hidden" }}
+                        on:click=move |_| set_show_mobile_sidebar.set(false)
                     >
                         <div 
                             class="fixed inset-0 bg-black/60 backdrop-blur-sm transition-opacity"
-                            on:click=move |_| set_show_mobile_sidebar.set(false)
                         ></div>
                         <aside 
                             class={format!("relative w-80 max-w-[85vw] h-full shadow-2xl p-6 flex flex-col animate-in slide-in-from-left duration-300 border-r {}", sidebar_bg)}