Number validation shouldn’t trigger on every input change

[shawwn]

Describe the bug
Number revalidation causes problems in places like the Velocity dialog box. If you want to enter a negative number, it won't let you type a minus sign because as soon as you type the minus sign by itself, it validates it and it's not a valid number. You have to do a workaround by typing a digit first, then putting a minus sign in front of it.

To Reproduce
Steps to reproduce the behavior:

1. Go to Velocity dialog box
2. Delete the existing number
3. Try typing a negative number
4. The moment you type the minus sign, it validates it as not a valid number.

Expected behavior
Number validation should only trigger after a user finishes entering a new value (e.g. if they click on a different UI element so that focus leaves a number entry field, or if they press enter).

Additional context
See discord conversation in #dev from @robertnhart: https://discord.com/channels/1109381965116870667/1284714220981583947/1335205910448046150