refactor: establish standalone application boundary

app/frontend/pages/rotation/page.js

@@ -1,8 +1,8 @@
 window.XiaobaiPageModules.register("rotation", ["rotationView"], {
+  bind: bindRotationEvents,
   enter: ["loadRotation"],
 });
 
-/* PRESERVATION-SOURCE-BEGIN app.js:1958-2124 */
 async function loadRotationHistory(force = false) {
   if (!state.dashboard || state.rotationLoading) return;
   const key = `${elements.tradeDate.value}:9`;
@@ -170,4 +170,14 @@ function renderRotationMembers() {
   bindStockRows(body);
 }
 
-/* PRESERVATION-SOURCE-END app.js:1958-2124 */
+
+function bindRotationEvents() {
+  document.querySelector("#rotationExportButton").addEventListener("click", exportRotation);
+  document.querySelectorAll("[data-rotation-order]").forEach((button) => {
+    button.addEventListener("click", () => {
+      state.rotationOrder = button.dataset.rotationOrder === "latest" ? "latest" : "oldest";
+      localStorage.setItem("xiaobaiRotationOrder", state.rotationOrder);
+      renderRotationHistory();
+    });
+  });
+}