Merge branch 'threecolumn' into shigusegubu-vue3

* threecolumn:
  fixes for mobile

src/components/chat/chat.vue

@@ -7,7 +7,7 @@
       >
         <div
           ref="header"
-          class="panel-heading -sticky chat-view-heading mobile-hidden"
+          class="panel-heading -sticky chat-view-heading"
         >
           <button
             class="button-unstyled go-back-button"

src/components/mobile_nav/mobile_nav.vue

@@ -5,7 +5,6 @@
     <nav
       id="nav"
       class="mobile-nav"
-      :class="{ 'mobile-hidden': isChat }"
       @click="scrollToTop()"
     >
       <div class="item">