One way to link Minecraft Dungeons with the minecraft launcher could be to ask for the log in information in each tab
When you open the launcher you immediately arrive to the news tab. When you click in the minecraft java icon it asks you to log in.
when you click on the dungeons icon it shows the same login message
when you are logged in your nickname shows on the top left corner of the screen
if you are not logged in it show the minecraft icon.
i think that could work
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