Fix left side of single column layout being cropped on smaller screens (mastodon#11894)

Fix mastodon#11476

Author: Gargron

app/javascript/styles/mastodon/components.scss

@@ -1893,6 +1893,7 @@ a.account__display-name {
       pointer-events: none;
       display: flex;
       justify-content: flex-end;
+      min-width: 285px;
 
       &--start {
         justify-content: flex-start;
@@ -1910,6 +1911,7 @@ a.account__display-name {
       box-sizing: border-box;
       width: 100%;
       max-width: 600px;
+      flex: 0 0 auto;
       display: flex;
       flex-direction: column;