[Feature Request] Email search feature on FlowCrypt inbox extension page

[martgil]

It would be extremely helpful for many users to have an email search feature on the FlowCrypt browser extension page (inbox.htm). Specifically, in some cases where FlowCrypt iframe on Gmail don't work due to an issue then the extension page can be use as an reliable alternative.

Reference: https://mail.google.com/mail/u/human@flowcrypt.com/#inbox/FMfcgzQbfpFXXfGDrxXgzqwXhZslkFTg