feat(portal-frontend): implement record-assessment form and closurePending display

Owned-mode form embedded in case-actions where the redirect link
isn't used. verifiedItems is comma-split client-side for convenience
only; the server re-validates everything regardless. closurePending
renders as a neutral success note (ADR-001), never as an error. 422
InvariantViolationResponse surfaces invariant+message verbatim in a
banner, matching the edit-details form's approach.

portal-frontend/src/app/case-detail/case-actions/case-actions.spec.ts

@@ -1,5 +1,6 @@
 import { ComponentFixture, TestBed } from '@angular/core/testing';
 
+import { CaseDetailService } from '../case-detail.service';
 import { CaseDetailActions } from '../case-detail.types';
 import { CaseActions } from './case-actions';
 
@@ -14,7 +15,10 @@ describe('CaseActions', () => {
   }
 
   beforeEach(async () => {
-    await TestBed.configureTestingModule({ imports: [CaseActions] }).compileComponents();
+    await TestBed.configureTestingModule({
+      imports: [CaseActions],
+      providers: [{ provide: CaseDetailService, useValue: { recordAssessment: () => { throw new Error('not stubbed'); } } }],
+    }).compileComponents();
   });
 
   const legacyActions: CaseDetailActions = {