* Add error summary component

* Move validation error messages to variable and add getter for errors

* Show error summary on submission of invalid form

* Enable submit button when form invalid

If the form is invalid the error summary will be shown.

* Focus error summary on invalid submission

* Do not update error summary until resubmission

* Style error summary

* Remove full stops from error messages

* Refactor error config

* Add dark mode styles

* Remove extra monthly active users inline error message

* Remove explicit typing from errorConfig

* Add unit test

* Refactor handleSubmit

* Delete empty css file

* Add class to center error text in error flex boxes

* Move type and constants to constants.ts

SFD-173 External links replace the Estimator view

* Reset error summary state on form reset

* Add resetErrors method

* Add storage service

* Store form data on value change

* Reduce number of form saves

* Restore stored data after input sets data

* Save raw form value

* Add comparator for CostRange

* Add method to get saved data

* Save control states

* Restore stored control states on init

* Rename storage methods

* Remove onInit calls from tests

* Mock storage service in tests

* Add explicit return types to storage service methods

* Move HostListener to top of class

* Persist error summary state

* Store state in single storage variable

* Add setControlStates method

* Clear stored state on form reset

* Use Map in MockStorageService

* Refactor storeFormState

* Refactor error summary state

* Add form state service

* Add tests for control state methods

* Use ?? operator in mock storage service

* Add tests for form storage

* Remove '' from beforeunload listener

* Use visibilitychange instead of beforeunload