chore: fix jest and tsconfig for Angular 21

Author: wlucha

jest.config.ts

@@ -3,6 +3,15 @@ import type { Config } from 'jest';
 const jestConfig: Config = {
   preset: 'jest-preset-angular',
   setupFilesAfterEnv: ['<rootDir>/setup-jest.ts'],
+  transform: {
+    '^.+\\.(ts|mjs|js|html)$': [
+      'jest-preset-angular',
+      {
+        tsconfig: '<rootDir>/tsconfig.spec.json',
+        stringifyContentPathRegex: '\\.(html|svg)$',
+      },
+    ],
+  },
 };
 
 export default jestConfig;