fix(calendar) : date-only contract filter + eager-load periods for print

Review follow-ups: (1) createFromFormat('Y-m-d') keeps the current time, so a raw
DateTime comparison wrongly excluded an employee ending on the from-day (and dropped
first-day absences); normalize from/to to day bounds and compare contract periods on
date only (Y-m-d), mirroring the calendar view. (2) eager-load contractPeriods in
findForPrintBySiteIds to avoid an N+1 during filtering. Added a boundary test.

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

tests/State/AbsencePrintProviderTest.php

@@ -62,6 +62,21 @@ final class AbsencePrintProviderTest extends TestCase
         self::assertFalse($this->hasInRange($provider, $employee, '2026-05-01', '2026-05-31'));
     }
 
+    public function testHasContractInRangeIncludesEmployeeEndingOnFromDayDespiteTimeComponent(): void
+    {
+        // Garde-fou : `from` portant une heure (cf. createFromFormat) ne doit pas exclure
+        // un employé dont le contrat finit pile le jour de `from` (comparaison date seule).
+        $provider = new ReflectionClass(AbsencePrintProvider::class)->newInstanceWithoutConstructor();
+        $employee = $this->buildEmployeeWithPeriod('2025-01-01', '2026-05-01');
+
+        $result = new ReflectionClass($provider::class)
+            ->getMethod('hasContractInRange')
+            ->invoke($provider, $employee, new DateTimeImmutable('2026-05-01 08:33:53'), new DateTimeImmutable('2026-05-31 23:59:59'))
+        ;
+
+        self::assertTrue($result);
+    }
+
     private function hasInRange(object $provider, Employee $employee, string $from, string $to): bool
     {
         return new ReflectionClass($provider::class)