frontend: Cluster chooser dialog should remember previous window size

[prisha-sh]

Current Behavior

The cluster chooser dialog always opens with the default dimensions.

Expected Behavior

The dialog should restore the user's previous resized dimensions locally.

Benefit

Improves usability on ultrawide and multi monitor setups.

[prisha-sh]

Hi @illume sir, I’m interested in working on this issue and would like to contribute a fix for it.
I’ve started looking into the related components already. Please assign this issue to me if it’s available. Thanks!