Simplify code for generating Atom feed

Author: thekid

composer.json

@@ -10,7 +10,7 @@
     "xp-framework/networking": "^10.4",
     "xp-forge/web": "^4.0",
     "xp-forge/web-auth": "^5.0",
-    "xp-forge/frontend": "^6.0",
+    "xp-forge/frontend": "^6.4",
     "xp-forge/rest-api": "^4.0",
     "xp-forge/rest-client": "^5.3",
     "xp-forge/handlebars-templates": "^3.0",

src/main/php/de/thekid/dialog/web/Feed.php

@@ -2,7 +2,6 @@
 
 use de\thekid\dialog\{Repository, Pagination};
 use util\Date;
-use web\Headers;
 use web\frontend\{Handler, Header, Get, Param, View};
 
 #[Handler('/feed')]
@@ -26,9 +25,9 @@ public function atom(#[Header('If-Modified-Since')] $since= null) {
     }
 
     return $view
-      ->header('Cache-Control', 'public, max-age=3600')
-      ->header('Content-Type', 'application/atom+xml; charset=utf-8')
-      ->header('Last-Modified', Headers::date($items[0]['date'] ?? null))
+      ->modified($items[0]['date'] ?? null)
+      ->cache('public, max-age=3600')
+      ->type('application/atom+xml; charset=utf-8')
     ;
   }
 }