install app message

app/views/shared/_navbar.html.erb

@@ -1,4 +1,5 @@
 <%= render 'shared/navbar_warning' %>
+<%= render 'shared/mobile_app_alert' if signed_in? && cookies[:mobile_app_alert].blank? && (browser_os == 'ios' || browser_os == 'android') %>
 <nav class="max-w-6xl mb-4 mx-auto px-4 md:px-2 py-3 flex items-center justify-between">
   <div class="flex items-center space-x-4">
     <a href="<%= root_path %>" class="text-2xl font-bold items-center flex space-x-2">