Change how content warnings and filters are displayed in web UI (#31365)

app/javascript/mastodon/components/status_banner.tsx

@@ -0,0 +1,37 @@
+import { FormattedMessage } from 'react-intl';
+
+export enum BannerVariant {
+  Yellow = 'yellow',
+  Blue = 'blue',
+}
+
+export const StatusBanner: React.FC<{
+  children: React.ReactNode;
+  variant: BannerVariant;
+  expanded?: boolean;
+  onClick?: () => void;
+}> = ({ children, variant, expanded, onClick }) => (
+  <div
+    className={
+      variant === BannerVariant.Yellow
+        ? 'content-warning'
+        : 'content-warning content-warning--filter'
+    }
+  >
+    {children}
+
+    <button className='link-button' onClick={onClick}>
+      {expanded ? (
+        <FormattedMessage
+          id='content_warning.hide'
+          defaultMessage='Hide post'
+        />
+      ) : (
+        <FormattedMessage
+          id='content_warning.show'
+          defaultMessage='Show anyway'
+        />
+      )}
+    </button>
+  </div>
+);