fix(icons): migrate admin dashboard to Lucide

Replace every PrimeIcons pi-* class (static and data-driven) in the
admin dashboard area with app-icon: dashboard-card, dashboard-shortcut-
card, dashboard-status-row, dashboard-timeline, and the icon data in
admin-dashboard.facade.ts / admin-dashboard-page.component.ts. Icon
fields on AdminDashboardQuickAction/Shortcut/DashboardTimelineEntry
are now typed AppIconName instead of string, so a typo or unmapped
icon name is a compile error instead of a silently blank icon.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/shared/ui/icon/icon-registry.ts

@@ -73,7 +73,8 @@ import {
   LucideUsers as Users,
   LucideVideo as Video,
   LucideX as X,
-  LucideXCircle as XCircle
+  LucideXCircle as XCircle,
+  LucideZap as Zap
 } from '@lucide/angular';
 
 /**
@@ -113,6 +114,7 @@ export const APP_ICONS = {
   edit: Pencil,
   trash: Trash2,
   copy: Copy,
+  save: Save,
   plus: Plus,
   plusCircle: PlusCircle,
   minus: Minus,
@@ -156,7 +158,8 @@ export const APP_ICONS = {
   layoutGrid: LayoutGrid,
   verified: BadgeCheck,
   video: Video,
-  circle: Circle
+  circle: Circle,
+  zap: Zap
 } as const;
 
 export type AppIconName = keyof typeof APP_ICONS;