Set up Jest configuration and update dependencies for testing.

- ⚙️ **Config**: Added Jest configuration files for testing
- 🗑️ **Chore**: Removed unused Karma configuration and assets
- 🛠️ **Refactor**: Updated return details store methods for better clarity
- 📚 **Docs**: Enhanced comments and documentation in return details store

package.json

@@ -5,7 +5,7 @@
     "ng": "ng",
     "start": "nx serve isa-app --ssl",
     "test": "nx test isa-app",
-    "ci": "nx test isa-app --watch=false --browsers=ChromeHeadless --code-coverage",
+    "ci": "npx nx run-many -t test --exclude isa-app -c ci",
     "build": "nx build isa-app --configuration=development",
     "build-prod": "nx build isa-app --configuration=production",
     "lint": "nx lint",
@@ -33,13 +33,13 @@
     "@microsoft/signalr": "^8.0.7",
     "@ng-icons/core": "^29.5.1",
     "@ng-icons/material-icons": "^29.5.1",
-    "@ngrx/component-store": "19.0.1",
-    "@ngrx/effects": "19.0.1",
-    "@ngrx/entity": "19.0.1",
-    "@ngrx/operators": "19.0.1",
-    "@ngrx/signals": "^19.0.1",
-    "@ngrx/store": "19.0.1",
-    "@ngrx/store-devtools": "19.0.1",
+    "@ngrx/component-store": "19.1.0",
+    "@ngrx/effects": "19.1.0",
+    "@ngrx/entity": "19.1.0",
+    "@ngrx/operators": "19.1.0",
+    "@ngrx/signals": "19.1.0",
+    "@ngrx/store": "19.1.0",
+    "@ngrx/store-devtools": "19.1.0",
     "angular-oauth2-oidc": "^17.0.2",
     "angular-oauth2-oidc-jwks": "^17.0.2",
     "lodash": "^4.17.21",