Add admin notifications for new Mastodon versions (#26582)

app/javascript/styles/mastodon/admin.scss

@@ -143,6 +143,11 @@ $content-width: 840px;
         }
       }
 
+      .warning a {
+        color: $gold-star;
+        font-weight: 700;
+      }
+
       .simple-navigation-active-leaf a {
         color: $primary-text-color;
         background-color: $ui-highlight-color;

app/javascript/styles/mastodon/components.scss

@@ -8860,7 +8860,8 @@ noscript {
   }
 }
 
-.dismissable-banner {
+.dismissable-banner,
+.warning-banner {
   position: relative;
   margin: 10px;
   margin-bottom: 5px;
@@ -8938,6 +8939,21 @@ noscript {
   }
 }
 
+.warning-banner {
+  border: 1px solid $warning-red;
+  background: rgba($warning-red, 0.15);
+
+  &__message {
+    h1 {
+      color: $warning-red;
+    }
+
+    a {
+      color: $primary-text-color;
+    }
+  }
+}
+
 .image {
   position: relative;
   overflow: hidden;

app/javascript/styles/mastodon/tables.scss

@@ -12,6 +12,11 @@
     border-top: 1px solid $ui-base-color;
     text-align: start;
     background: darken($ui-base-color, 4%);
+
+    &.critical {
+      font-weight: 700;
+      color: $gold-star;
+    }
   }
 
   & > thead > tr > th {