cleanup and fixes

src/components/chat_new/chat_new.scss

@@ -22,10 +22,10 @@
   }
 
   .go-back-button {
-    cursor: pointer;
-    width: 28px;
     text-align: center;
-    padding: 0.6em;
-    margin: -0.6em 0.6em -0.6em -0.6em;
+    line-height: 1;
+    height: 100%;
+    align-self: start;
+    width: var(--__panel-heading-height-inner);
   }
 }

src/components/chat_new/chat_new.vue

@@ -6,15 +6,15 @@
       ref="header"
       class="panel-heading"
     >
-      <a
-        class="go-back-button"
+      <button
+        class="button-unstyled go-back-button"
         @click="goBack"
       >
         <FAIcon
           size="lg"
           icon="chevron-left"
         />
-      </a>
+      </button>
     </div>
     <div class="input-wrap">
       <div class="input-search">