fix: `MkPageWindow` doesn't render custom emojis in the titlebar when displaying a user profile who has custom emojis in their display-name

What does this PR do?

This is implements a fix for when you open a user profile which has custom emojis in their user.name in a floating UI window. Previously it would render the emoji name in text instead of actually embedding the emoji in the title.

fixes issues/500

Image showcasing the emojis rendering properly and that the change does not interfere with usernames which lack custom emojis:

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