Sync both clan lists.

static/index.js

@@ -0,0 +1,25 @@
+function setupClanButtons(dropdownId, delBtnId, editBtnId) {
+    const dropdown = document.getElementById(dropdownId);
+    const deleteButton = document.getElementById(delBtnId);
+    const editButton = document.getElementById(editBtnId);
+
+    dropdown.addEventListener('change', function () {
+        deleteButton.disabled = !this.value;
+        editButton.disabled = !this.value;
+    });
+}
+
+function getClanLists(event) {
+    const button = event.relatedTarget;
+    const clanListId = button.getAttribute('data-bs-list');
+    const clanList = document.querySelector(clanListId);
+
+    let otherClanListId;
+    if (clanListId === '#home-clan')
+        otherClanListId = '#opponent-clan'
+    else
+        otherClanListId = '#home-clan'
+    const otherClanList = document.querySelector(otherClanListId);
+
+    return [clanList, otherClanList];
+}