Add audit logs.

APP/src/app/shared/services/page-header.service.ts

@@ -0,0 +1,23 @@
+import { Injectable, TemplateRef, signal } from '@angular/core';
+
+/**
+ * Bridges per-page action controls into the shared system header rendered by
+ * UserPortalComponent. A child route cannot project content into its parent
+ * shell through <router-outlet>, so pages register a TemplateRef here and the
+ * shell renders it in the header's right-side actions slot.
+ */
+@Injectable({ providedIn: 'root' })
+export class PageHeaderService {
+  /** The current page's action controls, or null when the page has none. */
+  readonly actions = signal<TemplateRef<unknown> | null>(null);
+
+  /** Called by a page (typically in ngAfterViewInit) to publish its actions. */
+  public setActions(actionsTemplate: TemplateRef<unknown> | null): void {
+    this.actions.set(actionsTemplate);
+  }
+
+  /** Called by a page in ngOnDestroy so its actions do not leak to the next page. */
+  public clear(): void {
+    this.actions.set(null);
+  }
+}