test(portal-frontend): add failing spec for case-actions mode-driven rendering

Red: case-actions has no template yet. Encodes the legacy-vs-owned
actions contract from CaseDetailResponseFactory - record-assessment
renders as a link only in redirect mode, take/release-ownership
buttons follow presence of their optional action key.

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

@@ -0,0 +1,13 @@
+import { Component, input } from '@angular/core';
+
+import { CaseDetailActions } from '../case-detail.types';
+
+@Component({
+  selector: 'app-case-actions',
+  imports: [],
+  templateUrl: './case-actions.html',
+  styleUrl: './case-actions.css',
+})
+export class CaseActions {
+  readonly actions = input.required<CaseDetailActions>();
+}