Fix IntelliJ complaints about missing routes() class.

* Adds src_manged/ to classpath
Close client action and validation of outstanding tasks.

* Working business logic, does validate, but UI does not
   yet show error detail (TODO).
Cleanup of client task code and error handling (I'm happy with this now).
Roughin of client tasks for HIRED & INTERVIEW
Implemented the client interview booking task, just needs UI.