refactor(validation): simplify exception formatting and remove unused import

- Consolidated multiline `InvalidArgumentException` calls into single-line for readability.
- Removed unused `FHIRValidationService` import from `FHIRValidationReportMapper`.

Author: Ardenexal

src/Component/Validation/src/FHIRValidationReportMapper.php

@@ -6,7 +6,6 @@
 
 use Ardenexal\FHIRTools\Component\Metadata\Attribute\Validation\FHIRPathInvariant;
 use Ardenexal\FHIRTools\Component\Metadata\Attribute\Validation\FHIRValueSetBinding;
-use Ardenexal\FHIRTools\Component\Validation\FHIRValidationService;
 use Ardenexal\FHIRTools\Component\Models\R4\DataType\IssueSeverityType as R4IssueSeverityType;
 use Ardenexal\FHIRTools\Component\Models\R4\DataType\IssueTypeType as R4IssueTypeType;
 use Ardenexal\FHIRTools\Component\Models\R4\Resource\OperationOutcome\OperationOutcomeIssue as R4Issue;
@@ -42,9 +41,7 @@ public function toOperationOutcome(
             'R4'    => $this->buildR4($report->violations),
             'R4B'   => $this->buildR4B($report->violations),
             'R5'    => $this->buildR5($report->violations),
-            default => throw new \InvalidArgumentException(
-                sprintf('Unsupported FHIR version "%s". Supported values: R4, R4B, R5.', $fhirVersion),
-            ),
+            default => throw new \InvalidArgumentException(sprintf('Unsupported FHIR version "%s". Supported values: R4, R4B, R5.', $fhirVersion)),
         };
     }
 
@@ -116,8 +113,8 @@ private function mapSeverity(string $severity): string
 
     private function mapIssueType(FHIRValidationViolation $violation): string
     {
-        if ($violation->code === FHIRViolationCode::EVAL_ERROR
-            || $violation->code === FHIRViolationCode::UNCHECKED_BINDING
+        if ($violation->code               === FHIRViolationCode::EVAL_ERROR
+            || $violation->code            === FHIRViolationCode::UNCHECKED_BINDING
             || $violation->constraintClass === FHIRValidationService::class) {
             return 'not-supported';
         }

src/Component/Validation/src/FHIRValidationService.php

@@ -103,9 +103,7 @@ public function validateForOperation(
         string $fhirVersion = 'R4',
     ): object {
         if (!in_array($mode, ['', 'create', 'update', 'profile', 'delete'], true)) {
-            throw new \InvalidArgumentException(
-                sprintf('Unsupported mode "%s". Supported values: \'\', create, update, profile, delete.', $mode),
-            );
+            throw new \InvalidArgumentException(sprintf('Unsupported mode "%s". Supported values: \'\', create, update, profile, delete.', $mode));
         }
 
         if ($mode === 'delete') {