Add Collapsible Components Tree

A collapsible components tree would make the installer much easier to navigate, especially for users working with large or deeply nested component sets. The idea is to allow categories to be expanded or collapsed using simple + / - buttons for controls, so users can quickly hide sections they don’t need at the moment.

It would also be helpful if the installer could remember the user’s expand/collapse state between installations or updates. This way, users who prefer a compact or fully expanded view wouldn’t have to reconfigure it every time they run the installer.