Fix downzaps

[ekzyis]

Description

TODO:

• [x] enable optimistic UX for downzaps
• [x] enable optimistic UX for zaps via dropdown

Checklist

Are your changes backwards compatible? Please answer below:

Yes

Did you QA this? Could we deploy this straight to production? Please answer below:

Yes

For frontend changes: Tested on mobile? Please answer below:

Did you introduce any new environment variables? If so, call them out explicitly here: