fix(giving): render Finance nav section in UserPortal sidebar

Task 11 added the finance nav to user-navbar.component, but the active
sidebar is rendered inline by UserPortalComponent (app-user-navbar is
not mounted). Added the role-gated Finance section (Offering Entry /
Givings / Giving Types) to UserPortalComponent, matching its
Administration pattern. Verified at runtime: section renders for
super_admin and links load the giving pages.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

APP/src/app/portals/user-portal/user-portal.component.html

@@ -73,6 +73,17 @@
                         </a>
                     </ng-container>
                 </div>
+
+                <div class="nav-section" *ngIf="showFinanceSection">
+                    <h4 *ngIf="!sidebarCollapsed">Finance</h4>
+                    <a *ngFor="let item of financeNavItems" class="nav-item" [class.active]="item.active"
+                        [title]="item.text" (click)="navigateTo(item.path)">
+                        <div class="nav-icon">
+                            <kendo-svgicon [icon]="item.icon"></kendo-svgicon>
+                        </div>
+                        <span *ngIf="!sidebarCollapsed">{{ item.text }}</span>
+                    </a>
+                </div>
             </nav>
 
             <div class="sidebar-footer" *ngIf="!sidebarCollapsed">