feat(sales): validate PDF timezone parameter

app/Domains/Shared/Rules/ValidTimezone.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Domains\Shared\Rules;
+
+use Closure;
+use DateTimeZone;
+use Exception;
+use Illuminate\Contracts\Validation\ValidationRule;
+
+class ValidTimezone implements ValidationRule
+{
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if (! is_string($value)) {
+            return;
+        }
+
+        try {
+            new DateTimeZone($value);
+        } catch (Exception) {
+            $fail(__('validation.timezone'));
+        }
+    }
+}