feat: Centralise sidebar ordering and add page visibility options (#1673)

frontend/src/utils/sidebarLayout.ts

@@ -0,0 +1,41 @@
+export const SIDEBAR_HIDDEN_SYSTEM_ITEMS_KEY = 'sidebarHiddenSystemItems';
+export const SIDEBAR_ORDER_KEY = 'sidebarOrder';
+export const SIDEBAR_LAYOUT_CHANGED_EVENT = 'sidebar-layout-changed';
+
+export function isExternalSidebarItemId(id: string): boolean {
+  return id.startsWith('ext-');
+}
+
+export function getSidebarOrder(defaultOrder: string[]): string[] {
+  const stored = localStorage.getItem(SIDEBAR_ORDER_KEY);
+  if (!stored) return defaultOrder;
+
+  try {
+    const parsed = JSON.parse(stored);
+    return Array.isArray(parsed) ? parsed.filter((id): id is string => typeof id === 'string') : defaultOrder;
+  } catch {
+    return defaultOrder;
+  }
+}
+
+export function saveSidebarOrder(order: string[]) {
+  localStorage.setItem(SIDEBAR_ORDER_KEY, JSON.stringify(order));
+  window.dispatchEvent(new CustomEvent(SIDEBAR_LAYOUT_CHANGED_EVENT));
+}
+
+export function getHiddenSidebarSystemItemIds(): string[] {
+  const stored = localStorage.getItem(SIDEBAR_HIDDEN_SYSTEM_ITEMS_KEY);
+  if (!stored) return [];
+
+  try {
+    const parsed = JSON.parse(stored);
+    return Array.isArray(parsed) ? parsed.filter((id): id is string => typeof id === 'string') : [];
+  } catch {
+    return [];
+  }
+}
+
+export function saveHiddenSidebarSystemItemIds(ids: string[]) {
+  localStorage.setItem(SIDEBAR_HIDDEN_SYSTEM_ITEMS_KEY, JSON.stringify(Array.from(new Set(ids))));
+  window.dispatchEvent(new CustomEvent(SIDEBAR_LAYOUT_CHANGED_EVENT));
+}