feat(client): let users hide and reorder sidebar rows and groups

Add a Customize sidebar mode, opened from any section menu or Cmd+K, that hides rows and groups
and reorders them by drag or keyboard, with reset and undo. The layout saves to a new
sidebarLayout setting; a hidden Book Dock or Requests row returns while work is waiting.
Also line up the Rows shown menu labels, which sat 3px apart.

Closes #1434

packages/types/src/auth.ts

@@ -47,6 +47,8 @@ export interface UserSettings {
   /** Separate from dashboardConfig so legacy clients replacing it preserve shelf preferences. */
   dashboardShelfConfig?: import("./dashboard").DashboardShelfConfig;
   sidebarConfig?: import("./sidebar").SidebarConfig;
+  /** Separate from sidebarConfig so an older client rewriting that key cannot wipe the layout. */
+  sidebarLayout?: import("./sidebar").SidebarLayout | null;
   achievementPreferences?: {
     enabled?: boolean;
   };

packages/types/src/sidebar.ts

@@ -36,6 +36,19 @@ export interface SidebarConfig {
   sections: Record<SidebarSectionId, SidebarSectionState>;
 }
 
+/**
+ * Which sidebar rows and groups a user hid, and the order they arranged them in. Ids are nav entry
+ * ids (`series`, `book-dock`) and group ids (`browse`, `libraries`); ids a client does not know are
+ * ignored, and ids missing from an order fall back to their default position.
+ */
+export interface SidebarLayout {
+  hidden: string[];
+  /** Movable groups, top to bottom. The top group is pinned and never listed. */
+  groupOrder: string[];
+  /** Row order inside each nav group, keyed by group id. */
+  rowOrder: Record<string, string[]>;
+}
+
 /** Totals behind the sidebar Browse badges, served as one cached payload so the shell needs a single request. */
 export interface BrowseCounts {
   authors: number;