feat : surlignage des jours fériés sur la vue semaine des heures

Quand un employé n'a pas d'absence sur un jour férié, la cellule prend le fond bleu clair (#b3e5fc) et affiche le nom du férié au survol — cohérent avec la vue jour.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/State/WorkHourWeeklySummaryProviderTest.php

@@ -66,6 +66,7 @@ final class WorkHourWeeklySummaryProviderTest extends TestCase
             $this->buildResolverStub(),
             new DailyReferenceMinutesResolver(),
             $this->buildHolidayResolver(),
+            $this->buildHolidayService(),
         );
 
         $this->expectException(AccessDeniedHttpException::class);
@@ -128,6 +129,7 @@ final class WorkHourWeeklySummaryProviderTest extends TestCase
             $this->buildWeeklyResolverStub($employees),
             new DailyReferenceMinutesResolver(),
             $this->buildHolidayResolver(),
+            $this->buildHolidayService(),
         );
 
         $result = $provider->provide(new Get());
@@ -179,15 +181,20 @@ final class WorkHourWeeklySummaryProviderTest extends TestCase
     }
 
     private function buildHolidayResolver(array $holidayMap = []): HolidayVirtualHoursResolver
+    {
+        return new HolidayVirtualHoursResolver(
+            new DailyReferenceMinutesResolver(),
+            $this->buildHolidayService($holidayMap),
+            $this->createStub(EmployeeContractResolver::class),
+        );
+    }
+
+    private function buildHolidayService(array $holidayMap = []): PublicHolidayServiceInterface
     {
         $service = $this->createStub(PublicHolidayServiceInterface::class);
         $service->method('getHolidaysDayByYears')->willReturn($holidayMap);
 
-        return new HolidayVirtualHoursResolver(
-            new DailyReferenceMinutesResolver(),
-            $service,
-            $this->createStub(EmployeeContractResolver::class),
-        );
+        return $service;
     }
 
     private function buildResolverStub(): EmployeeContractResolver