Hide show/close buttons on mobile

iOS can't handle text fields that are potentially megabytes big, and
the close button is superfluous

ts/import-page/CloseButton.svelte

@@ -19,7 +19,7 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 </script>
 
 <div
-    class="fixed-header d-flex flex-row-reverse justify-content-between"
+    class="fixed-header d-flex flex-row-reverse justify-content-between desktop-only"
     bind:this={container}
 >
     <LabelButton

ts/import-page/QueueSummary.svelte

@@ -26,7 +26,7 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         </IconConstrain>
         {summary.summaryTemplate({ count: notes.length })}
         {#if summary.canBrowse}
-            <button on:click={onShow}>{tr.importingShow()}</button>
+            <button class="desktop-only" on:click={onShow}>{tr.importingShow()}</button>
         {/if}
     </li>
 {/if}