Take over read status from server

[bjoern-tantau]

Is your feature request related to a problem? Please describe.

When I read posts using the web app or another app they will get marked as read and disappear when I disable "shoe read posts" in the profile settings. But if "show read posts" is enabled on the server (to work around LemmyNet/lemmy-ui#1186) those read posts will appear in Voyager even when read posts are hidden in the app.

Describe the solution you'd like

When posts are retrieved from the server and they are marked as read they should also be marked as read in Voyager and hidden accordingly.

Describe alternatives you've considered

Disabling "show read posts" on the server is a workaround, but then you run into LemmyNet/lemmy-ui#1186

[aeharding]

Hi! I recommend never unchecking "show read posts" through lemmy-ui with Voyager. It wreaks all sorts of havok that cannot be avoided due to LemmyNet/lemmy#4124. Once that is resolved this will no longer be a problem.