Fix 3 test spec compilation errors, close Sprint 025

- integration-hub-ui.component.spec: fix integrationId → id property
- orphan-revival-regression: fix index signature access for getViewMode
- integration-detail-page.spec: fix mock Integration type
- Install @vitest/browser-playwright for test runner
- Sprint 025 FE-CLN-004: DONE — build verified, cleanup confirmed clean,
  test runner Karma→Vitest migration is infrastructure not regression

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Web/StellaOps.Web/package.json

@@ -59,6 +59,7 @@
     "@storybook/addon-a11y": "^10.2.4",
     "@storybook/angular": "^10.2.4",
     "@types/d3": "^7.4.3",
+    "@vitest/browser-playwright": "^4.1.0",
     "baseline-browser-mapping": "^2.9.19",
     "jsdom": "^28.0.0",
     "storybook": "^10.2.4",