feat: split booking between participants and applicant

addresses #869f2q1vu

tests/Service/ParticipantDataPrefillerTest.php

@@ -300,7 +300,33 @@ class ParticipantDataPrefillerTest extends TestCase
         $this->assertSame('[email protected]', $participant->email);
         $this->assertSame('2006-01-15', $participant->dateOfBirth?->format('Y-m-d'));
         $this->assertSame('Musterstr. 123', $participant->address?->street);
-        $this->assertSame('DE', $participant->address?->country);
+        $this->assertSame(
+            'D',
+            $participant->address?->country,
+            "BusPro's country tokens are not ISO codes: 'DE' matches no choice and leaves the select empty"
+        );
+
+        CarbonImmutable::setTestNow();
+    }
+
+    public function testFillDummyApplicantSetsACompleteAdult(): void
+    {
+        CarbonImmutable::setTestNow(CarbonImmutable::create(2026, 1, 15, 14, 30));
+
+        $applicant = new ParticipantDto();
+        $this->service()->fillDummyApplicant($applicant);
+
+        $this->assertSame('Probeelternteil', $applicant->firstName);
+        $this->assertSame('Elternteil 14:30', $applicant->lastName);
+        $this->assertSame('[email protected]', $applicant->email);
+        $this->assertSame('0171/222222', $applicant->mobile);
+        $this->assertSame('Probeweg 7', $applicant->address?->street);
+
+        // The applicant block requires these, unlike a participant.
+        $this->assertSame('W', $applicant->gender);
+        $this->assertSame('D', $applicant->nationality);
+        $this->assertSame('D', $applicant->address?->country);
+        $this->assertGreaterThanOrEqual(18, $applicant->getAge());
 
         CarbonImmutable::setTestNow();
     }