feat: make sorting by date work

WebApp/ts/eventList.ts

@@ -1,9 +1,16 @@
-document.addEventListener("DOMContentLoaded", async () => {
+var isAscending: boolean = false;
+
+function toggleListSortOrder() {
+    isAscending = !isAscending;
+    loadEvents();
+}
+
+async function loadEvents() {
     const container = document.getElementById("eventList");
     if (!container) return;
 
     try {
-        const res = await fetch("/api/events");
+        const res = await fetch("/api/events" + (isAscending ? "?sort=asc" : ""));
         if (!res.ok) throw new Error("Błąd pobierania wydarzeń");
 
         const events = await res.json();
@@ -31,4 +38,13 @@
         container.innerHTML = `<p class="text-danger">Błąd ładowania danych.</p>`;
         console.error(err);
     }
+}
+
+document.addEventListener("DOMContentLoaded", async () => {
+    loadEvents();
+    // listen for clicks
+    const listSortToggleButton = document.getElementById("list-sort-btn");
+    if (listSortToggleButton) {
+        listSortToggleButton.addEventListener("click", toggleListSortOrder);
+    }
 });