UI improvements - optimized for small screens, drawer now works properly, disabled scrolling when modal dialog is appeared.

src/app.rs

@@ -36,12 +36,36 @@ impl MenuHelper {
     }
 }
 
+#[derive(Clone, Copy)]
+pub struct DialogHelper {
+    opened: RwSignal<bool>
+}
+
+impl DialogHelper {
+    pub fn new() -> Self {
+        let opened = create_rw_signal(false);
+        Self {
+            opened
+        }
+    }
+
+    pub fn set_opened(&self, opened: bool) {
+        self.opened.set(opened);
+    }
+
+    pub fn is_open(&self) -> bool {
+        self.opened.get()
+    }
+}
+
 #[component]
 pub fn App() -> impl IntoView {
     // Provides context that manages stylesheets, titles, meta tags, etc.
     provide_meta_context();
     init_locales();
     provide_context(MenuHelper::new());
+    provide_context(MenuOpener::new());
+    provide_context(DialogHelper::new());
 
     view! {
         <Header/>