feat: Warnung, wenn lokale Werte ein zugewiesenes Preset überdecken

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

tests/Support/ComposeFixture.php

@@ -247,21 +247,24 @@ final class ComposeFixture
 
     /**
      * PresetAssignment as the live wiring builds it: the book is $book (default: bookOf($design), else of the sample
-     * design system), the id check is the cleaner's keepsId().
+     * design system), the id check is the cleaner's keepsId(). $load replaces $book with a loader the test can
+     * count.
      *
      * @param (Closure(string): array<string, string>)|null $groupsOf
+     * @param (Closure(): PresetBook)|null                  $load
      */
     public static function presetAssignment(
         ?PresetBook $book = null,
         ?Closure $groupsOf = null,
         ?DesignSystem $design = null,
-        ?ValueCleaner $cleaner = null
+        ?ValueCleaner $cleaner = null,
+        ?Closure $load = null
     ): PresetAssignment {
         $book ??= self::bookOf($design ?? DiviFixtures::designSystem());
         $cleaner ??= self::cleaner();
 
         return new PresetAssignment(
-            static fn (): PresetBook => $book,
+            $load ?? static fn (): PresetBook => $book,
             $groupsOf ?? static fn (string $module): array => [],
             $cleaner->keepsId(...)
         );