Nextjs refactor: Fix age persistence behavior when selecting categories on the Filter screen

[adambard1]

• Age only persists if you click outside of the Age field before making another selection
• If you don't click outside the age field after entering it, the age is lost.
• Conversely you can't delete the age and then choose another category without age being repopulated unless you can clicked somewhere on the page

I appreciate that the Age field turns blue to indicate you are entering info, but it's definitely not intuitive I suspect the Age should work like search, with an X to delete it, and it persists until you delete either in the field or by clicking the yellow pill. FYI - given the Age pill is a very different sort of info, perhaps it could be blue with white text with colors from our design system (the inverse colors, and a nod to GoGetta) - but I appreciate it's a designers choice.

1. Deleted age is repopulated... https://github.com/user-attachments/assets/3fadba3f-48b6-41a8-91af-5f78fb06b677

[adambard1]

2. Age not maintained when selecting categories

https://github.com/user-attachments/assets/4c0e3c11-0934-429a-a77c-733ed699f338

[adambard1]

Age is persisting, which is great. Fix is ready to deploy. Not sure if the loading messages have anything to do with this fix.