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

Conflicts:
- `app/controllers/concerns/sign_in_token_authentication_concern.rb`:
  Upstream removed this file, while glitch-soc had changes to deal with
  its theming system.
  Removed the file like upstream did.

app/javascript/styles/mailer.scss

@@ -435,6 +435,10 @@ h5 {
     background: $success-green;
   }
 
+  &.warning-icon td {
+    background: $gold-star;
+  }
+
   &.alert-icon td {
     background: $error-red;
   }