Pin conversation row title text to .foregroundStyle(.primary) instead
of the implicit default — under List's sidebar/source-list style,
AppKit's row highlighting could resolve default text to black on a
just-interacted-with row (e.g. right after a drag/context-menu move),
making it unreadable. Also drop Section(isExpanded:), which was
rendering its own native disclosure chevron on the right in addition
to the custom one already in the header on the left; folder collapse
now works purely off the existing collapsedFolders state with a plain
Section, so only the intended left-side chevron remains.
rune
7fbac5e809