handle preview not visible when tagging users in post

[thebigbadme]

When creating a post and tagging a user, whereas the native bsky webclient requires some effery to get profile preview to appear (type in some amount of tag, press space, then backspace to put cursor adjacent to tag, even partial tag, then preview appears), akari webclient does not provide preview which makes it more difficult to know if you've tagged in the intended/correct user.
This is the case at least in Firefox on Android and on Ubuntu, unknown if the same behavior exists with other browsers/operating systems.