Avoid emptying and recreating all UI cards on every update (#21990)

Avoid emptying and recreating all UI cards on every update (#21990)

By making the UI elements persistent, it allows tooltips to remain
on-screen when other elements are updated - in particular, the number
of research points, which is updated regularly.

Co-authored-by: Eoin Mcloughlin <helloworld@eoinrul.es>