feat: display warning banner when using the app with no account

app/assets/javascripts/views/notes/notes-view.pug

@@ -3,7 +3,7 @@
     #notes-title-bar.section-title-bar
       .padded
         .section-title-bar-header
-          .title {{self.state.panelTitle}}
+          .sk-h2.font-semibold.title {{self.state.panelTitle}}
           .sk-button.contrast.wide(
             ng-click='self.createNewNote()',
             title='Create a new note in the selected tag'
@@ -24,6 +24,10 @@
             ng-click='self.clearFilterText();',
             ng-show='self.state.noteFilter.text'
             ) ✕
+        no-account-warning(
+          application='self.application'
+          app-state='self.appState'
+        )
       #notes-menu-bar.sn-component
         .sk-app-bar.no-edges
           .left