move most isikukood.js usage to utils

app/home/(user)/_lib/server/load-analysis-packages.ts

@@ -1,5 +1,4 @@
 import { cache } from 'react';
-import Isikukood, { Gender } from 'isikukood';
 
 import { listProductTypes, listProducts } from "@lib/data/products";
 import { listRegions } from '@lib/data/regions';
@@ -8,6 +7,7 @@ import type { StoreProduct } from '@medusajs/types';
 import { loadCurrentUserAccount } from './load-user-account';
 import { AccountWithParams } from '@/packages/features/accounts/src/server/api';
 import { AnalysisPackageWithVariant } from '@kit/shared/components/select-analysis-package';
+import PersonalCode from '~/lib/utils';
 
 async function countryCodesLoader() {
   const countryCodes = await listRegions().then((regions) =>
@@ -32,27 +32,8 @@ function userSpecificVariantLoader({
   if (!personalCode) {
     throw new Error('Personal code not found');
   }
-  const parsed = new Isikukood(personalCode);
-  const ageRange = (() => {
-    const age = parsed.getAge();
-    if (age >= 18 && age <= 29) {
-      return '18-29';
-    }
-    if (age >= 30 && age <= 39) {
-      return '30-39';
-    }
-    if (age >= 40 && age <= 49) {
-      return '40-49';
-    }
-    if (age >= 50 && age <= 59) {
-      return '50-59';
-    }
-    if (age >= 60) {
-      return '60';
-    }
-    throw new Error('Age range not supported');
-  })();
-  const gender = parsed.getGender() === Gender.MALE ? 'M' : 'F';
+
+  const { gender, ageRange } = PersonalCode.parsePersonalCode(personalCode);
 
   return ({
     product,