web: Domain-spezifische Favicons und App-Icons für alle drei Marken (R5.4)

Eigene Icon-Sets unter public/icons/{pressekonto,presseecho,businessportal24}
(SVG-Favicon + Touch-/App-Icons); ThemeHelper mappt das aktive Theme auf den
Icon-Ordner (Portal/Admin nutzt den pressekonto-Satz), alle Layout-Heads
binden Favicon + apple-touch-icon domain-abhängig ein.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/Helpers/ThemeHelper.php

@@ -34,13 +34,39 @@ class ThemeHelper
     }
 
     /**
-     * Get the favicon path based on the current theme
+     * Map the current theme to its icon folder under public/icons.
+     *
+     * Das Portal-/Admin-Theme läuft auf pressekonto.test und nutzt daher
+     * den pressekonto-Iconsatz.
      */
-    public static function getFaviconPath(): string
+    public static function getIconFolder(): string
     {
         $theme = config('app.theme', 'portal');
 
-        return "img/favicons/{$theme}-favicon.ico";
+        $folderMap = [
+            'portal' => 'pressekonto',
+            'pressekonto' => 'pressekonto',
+            'presseecho' => 'presseecho',
+            'businessportal24' => 'businessportal24',
+        ];
+
+        return $folderMap[$theme] ?? 'pressekonto';
+    }
+
+    /**
+     * Get the favicon (SVG) path based on the current theme.
+     */
+    public static function getFaviconPath(): string
+    {
+        return 'icons/'.self::getIconFolder().'/favicon.svg';
+    }
+
+    /**
+     * Get the larger app/touch icon (SVG) path based on the current theme.
+     */
+    public static function getAppIconPath(): string
+    {
+        return 'icons/'.self::getIconFolder().'/icon.svg';
     }
 
     /**