fix(signage-manager): update tests for ts-client API-based services

Update test suites to work with the refactored services that use
ts-client HTTP calls instead of localStorage mocks. Mock OrganisationService
and ToastService via Angular DI providers, mock ts-client get/post/put/del,
and remove obsolete localStorage/cache tests. Add suneditor to Jest
transformIgnorePatterns to fix ESM parsing.

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: shrikha56

apps/signage-manager/jest.config.ts

@@ -12,7 +12,7 @@ export default {
             },
         ],
     },
-    transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$)'],
+    transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$|suneditor)'],
     snapshotSerializers: [
         'jest-preset-angular/build/serializers/no-ng-attributes',
         'jest-preset-angular/build/serializers/ng-snapshot',