An interceptor adds the token in Angular
Angular interview exercise on HttpClient, difficulty 3 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
TokenService holds a `token` signal ("" when signed out). Write authInterceptor: when a token is set, it adds the header Authorization: Bearer <token> to every request; without one the request goes out untouched. Export `appConfig` providing HttpClient with the interceptor. ProfileComponent loads GET /api/me ({ name }) into a `me` signal and shows the name in <p class="name">.
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