fix(mobile): improved context menu dismissal on iOS and removed white bar on Android

frontend/input.css

@@ -6,6 +6,6 @@
 
     html,
     body {
-        @apply h-full w-full overflow-hidden bg-base-100 text-base-content;
+        @apply min-h-[100dvh] w-full overflow-hidden bg-base-100 text-base-content overscroll-behavior-y-none;
     }
 }

frontend/src/components/context_menu.rs

@@ -25,7 +25,10 @@ pub fn ContextMenu(
         // Backdrop to catch clicks outside
         <div 
             class="fixed inset-0 z-[99] cursor-default" 
+            role="button"
+            tabindex="-1"
             on:click=move |_| on_close.call(())
+            on:touchstart=move |_| on_close.call(())
             on:contextmenu=move |e| e.prevent_default()
         ></div>