Allow heading tags (h1-h6) in ContentSanitizer so news editor headings render

app/Http/Controllers/News/NewsRssController.php

@@ -4,6 +4,7 @@ namespace App\Http\Controllers\News;
 
 use App\Http\Controllers\Controller;
 use Illuminate\Http\Response;
+use Illuminate\Support\Facades\Cache;
 use cPad\Plugins\News\Models\NewsArticle;
 
 class NewsRssController extends Controller
@@ -14,13 +15,17 @@ class NewsRssController extends Controller
      */
     public function feed(): Response
     {
-        $articles = NewsArticle::with('author', 'category')
-            ->published()
-            ->orderByDesc('published_at')
-            ->limit(config('news.rss_limit', 25))
-            ->get();
+        $ttl = max(60, (int) config('news.rss_cache_ttl', 300));
 
-        $xml = $this->buildRss($articles);
+        $xml = Cache::remember('news.rss.feed', $ttl, function (): string {
+            $articles = NewsArticle::with('author', 'category')
+                ->published()
+                ->orderByDesc('published_at')
+                ->limit(config('news.rss_limit', 25))
+                ->get();
+
+            return $this->buildRss($articles);
+        });
 
         return response($xml, 200, [
             'Content-Type' => 'application/rss+xml; charset=UTF-8',