Allow scrolling through configurtion sections

Many configuration sections only contain very few options, wasting lots of space and introducing unneeded friction when searching for some configuration option.

Left side click should snap scrolling position.

Add support for section folding, by default true for decompilation implementation options.

Edit:
As a little bonus, can tree behaviour be modified to toggle expand state when clicking on an expandable node + not expand all categories by default?

The issue names no files, tests, or entry points. Start by locating the configuration-section UI and the expandable tree, then determine how section scrolling and expansion are currently handled. Done means sections can fold and scroll as requested, decompilation implementation options default folded, and tree nodes toggle without expanding every category by default.

Written by the indexing model from the issue text.