Refactor API and enhance Angular integration

- Removed `ciTargetName` from `nx.json`.
- Updated `package.json` to include new dependencies: `@types/seedrandom`, `fast-check`, `happy-dom`, and `@nestjs/schedule`.
- Modified `pnpm-lock.yaml` to reflect the addition of new packages and their versions.
- Improved project documentation in `PROJECT_CONTEXT.md` to clarify the use of Zod schemas and Angular framework decisions.
- Introduced new Angular components and patterns in the `.agents/skills/frontend-angular` directory, including examples and reference materials for Angular 21+ features.

apps/overlay/project.json

@@ -62,8 +62,10 @@
       "executor": "@nx/eslint:lint"
     },
     "test": {
-      "executor": "@angular/build:unit-test",
-      "options": {}
+      "executor": "@nx/vitest:test",
+      "options": {
+        "configFile": "apps/overlay/vitest.config.mts"
+      }
     },
     "serve-static": {
       "continuous": true,