Add types to fluent table code

[pamelafox]

Purpose

Attempted fix for #671 (comment)
I haven't replicated the type warnings but it builds for me with these types, so probably is a helpful change.

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• cd app/frontend
• npm install;npm run build