fix feedback popup layout

src/app/admin/feedback/Feedback.svelte

@@ -20,7 +20,8 @@
   {dateFormat.format(new Date(value))}
 {/snippet}
 
-<DataTable
+<div class="h-screen flex flex-col justify-between">
+  <DataTable
     data={feedbacks}
     count={true}
     keys={[
@@ -30,6 +31,9 @@
       { key: 'content', label: 'Inhalt', width: 10 }
     ]}
     onClick={(feedback) => (activeFeedback = feedback)}
-/>
+  />
 
-<BottomBar feedback={activeFeedback} />
+  {#key activeFeedback}
+    <BottomBar feedback={activeFeedback} />
+  {/key}
+</div>