Text input date validation

[nichwall]

Brief summary

This PR adds a check for a non-null value for date-time fields in the web client to ensure null is not incorrectly submitted.

Which issue is fixed?

Fixes #3775 and partially fixes #1519

In-depth Description

The submit button now checks that the date-time field to ensure that it is non-null. The datetime will be null if any field (day, month, year, hour, minute) is not set. I added a new error toast to inform the user of the date not being formatted correctly.

We could have the UI element default to 12:00 AM if only the time is not specified, such as is mentioned in #1519, as well as to ensure that different browsers render the "default" time correctly, such as Safari in #3775.

How have you tested this?

Tested the web client with fully valid datetimes, each individual field missing, and no change to the date.
Tested using Firefox.

Screenshots

[nichwall]

I spent some more time trying to figure out how to get the hours and minutes to automatically set to 12:00 if not set, but could not figure it out, so just leaving it as a submission error if everything is not set.

[advplyr]

There was an issue with this in that you couldn't remove the pub date after it was already set. I'm not sure why you would want to do that but it should still be possible.

I made some updates using the validation set on the datetime input.

I don't think it is possible to automatically set the time to 12:00 AM unless we create our own datetime input.

As far as I know it is not possible to get the value of an incomplete or invalid date in a native HTML datetime input. The "value" on the HTML input is only set when the date is valid. If you enter "6/31/2024 12:00 AM" it will still not populate the value.

The validity object is set though which we can use to check for any bad input. When the date is not set at all validity.badInput is false, so we can use this to check if we should show the error toast message or not.

I also added a red border anytime badInput is true as well as updated the toast message to cover both invalid and incomplete.

[advplyr]

Thanks!

[nichwall]

Thanks for cleaning that up! I figured there was a better way to do it, I was mostly just trying to get the framework sorted out.