Twig config improvements (#5923)

* deprecate direct kimai_config access, which was only used internally
* prevent access to system configs
* prevent access to most configs in sandbox environments

src/Twig/Context.php

@@ -9,12 +9,11 @@
 
 namespace App\Twig;
 
-use App\Configuration\SystemConfiguration;
 use Symfony\Component\HttpFoundation\RequestStack;
 
 final class Context
 {
-    public function __construct(private SystemConfiguration $systemConfiguration, private RequestStack $requestStack)
+    public function __construct(private readonly RequestStack $requestStack)
     {
     }
 
@@ -58,8 +57,8 @@ final class Context
 
     public function getBranding(string $config): mixed
     {
-        @trigger_error('Use "kimai_config" instead of "kimai_context" to access system configurations', E_USER_DEPRECATED);
+        @trigger_error('Use config() instead of "kimai_context" to access system configurations', E_USER_DEPRECATED);
 
-        return $this->systemConfiguration->find('theme.branding.' . $config);
+        return null;
     }
 }