Collapsible sections in the Desktop and Web inspectors

Add collapsible property sections to the Desktop and Web designer inspectors, with a consistent appearance across Studio's designers. Users can hide sections they are not currently working with, reducing scrolling while keeping the selected control's properties easy to find.

Section headers remain visible when collapsed, and each section can be expanded independently using the mouse or keyboard. Existing property editing and Undo/Redo continue to work.