feat: add tabs

assets/js/shortcodes/tabs.js

@@ -0,0 +1,41 @@
+function initTabs() {
+  tabClickHandler = (event) => {
+    const button = event.target.closest(".tab__button");
+    if (!button) return;
+
+    const container = button.closest(".tab__container");
+    const tabIndex = parseInt(button.dataset.tabIndex);
+    activateTab(container, tabIndex);
+  };
+
+  document.addEventListener("click", tabClickHandler);
+}
+
+function activateTab(container, activeIndex) {
+  const buttons = container.querySelectorAll(".tab__button");
+  const panels = container.querySelectorAll(".tab__panel");
+
+  buttons.forEach((btn, index) => {
+    if (index === activeIndex) {
+      btn.classList.add("tab--active");
+      btn.setAttribute("aria-selected", "true");
+    } else {
+      btn.classList.remove("tab--active");
+      btn.setAttribute("aria-selected", "false");
+    }
+  });
+
+  panels.forEach((panel, index) => {
+    if (index === activeIndex) {
+      panel.classList.add("tab--active");
+    } else {
+      panel.classList.remove("tab--active");
+    }
+  });
+}
+
+if (document.readyState === 'loading') {
+  document.addEventListener('DOMContentLoaded', initTabs);
+} else {
+  initTabs();
+}