year & month replaced by yearMonth object

app/ui/AddMonthButton.tsx

@@ -1,12 +1,13 @@
 import { PlusCircleIcon } from "@heroicons/react/24/outline";
 import React from "react";
+import { formatYearMonth } from "../lib/format";
+import { YearMonth } from "../lib/db-types";
 
 export interface AddMonthButtonProps {
-    year: number;
-    month: number;
+    yearMonth: YearMonth;
 }
 
-export const AddMonthButton:React.FC<AddMonthButtonProps> = ({ year, month }) =>
-<a href={`/year-month/${year}-${month<10?"0":""}${month}/add`} className='grid self-center tooltip' data-tip="Dodaj novi mjesec">
+export const AddMonthButton:React.FC<AddMonthButtonProps> = ({ yearMonth }) =>
+<a href={`/year-month/${formatYearMonth(yearMonth)}/add`} className='grid self-center tooltip' data-tip="Dodaj novi mjesec">
     <PlusCircleIcon className="h-[1em] w-[1em] cursor-pointer text-4xl" />
 </a>