feat(work-status): add opt-in turn statistics (#3177)

Add optional completed-turn statistics without changing the existing panel layout. Separate final text delivery speed from whole-turn throughput, preserve scope and opt-in settings, and explain each metric with localized delayed tooltips.

Validated focused telemetry, lifecycle, sync and persistence tests, all-workspace type-check and lint, web builds, the 12-locale narrow layout, and full GitHub CI.

packages/ui/src/lib/desktop.ts

@@ -79,6 +79,8 @@ export type DesktopSettings = {
   workStatusPanelEnabled?: boolean;
   /** Work-status panel sections the user switched off. */
   workStatusHiddenSections?: string[];
+  /** True when the hidden-section list was explicitly chosen by the user. */
+  workStatusHiddenSectionsExplicit?: boolean;
   collapsibleThinkingBlocks?: boolean;
   showDeletionDialog?: boolean;
   nativeNotificationsEnabled?: boolean;