Stale fiat rate improvements #224
Description
Summary
When the fiat conversion rate is either invalid or stale, we need to handle the conversions throughout the app. With a concern primarily around the send flow as that's where conversion errors are most impactful.
Possible solutions
- Hide or disable the fiat rate options and display if the fiat rate is too old, possibly 5 minutes?
- or invalid, such as an error in the server response.
- The timestamp of the fiat rate comes back within the response.
Concerns
- Fiat rate update also needs to use the new price index point.
*. This may be a good time to change to the new endpoint while fixing the stale fiat issue. - Required to fix this before considering SLP price display.