功能迁移，页面整体样式修改

frontend-web/src/core/page-layout/sidebar-enabled.ts

@@ -0,0 +1,22 @@
+export const PAGE_SIDEBAR_QUERY_PARAM = "sidebar";
+
+const STORAGE_KEY = "deerflow-page-sidebar-enabled";
+
+export function isSidebarEnabledFromSearch(search: string): boolean {
+  const params = new URLSearchParams(
+    search.startsWith("?") ? search : `?${search}`,
+  );
+  return params.get(PAGE_SIDEBAR_QUERY_PARAM) === "1";
+}
+
+export function persistSidebarEnabled(enabled: boolean): void {
+  if (enabled) {
+    sessionStorage.setItem(STORAGE_KEY, "1");
+  } else {
+    sessionStorage.removeItem(STORAGE_KEY);
+  }
+}
+
+export function readSidebarEnabled(): boolean {
+  return sessionStorage.getItem(STORAGE_KEY) === "1";
+}