Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `app/views/admin/settings/appearance/show.html.haml`:
  Upstream enforced an uniform code style around lambdas, and glitch-soc
  had a different lambda due to its theming system.
  Applied the same code style changes.
- `app/views/settings/preferences/appearance/show.html.haml`:
  Upstream enforced an uniform code style around lambdas, and glitch-soc
  removed some code just after the lambda.
  Applied the same code style changes.

app/javascript/mastodon/features/ui/index.jsx

@@ -479,10 +479,12 @@ class UI extends PureComponent {
   };
 
   handleHotkeyBack = () => {
-    if (window.history && window.history.state) {
-      this.context.router.history.goBack();
+    const { router } = this.context;
+
+    if (router.history.location?.state?.fromMastodon) {
+      router.history.goBack();
     } else {
-      this.context.router.history.push('/');
+      router.history.push('/');
     }
   };