Course tree (lesson-page sidebar + dashboard's loaded-course view) and
File Management's Manage Library browser both move from boxed,
bordered rows to a flat list: no per-row background/border, a small
leading chevron that doubles as the expand affordance instead of a
separate right-edge button, indentation for hierarchy. The chevron's
rotation is pure CSS (:has(+ .tree-content.expanded) / :has(+
.curate-children.expanded)) rather than JS swapping glyph text, which
also let a fair amount of now-redundant JS come out.
The course tree's new styles are scoped under .tree-container (course
dashboard) and .lesson-sidebar (lesson page) so they don't leak into
the Library folder browser and other rows that reuse the same base
.tree-header/.lesson-item/etc. class names elsewhere in
course_dashboard.html - confirmed those are visually untouched.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
rmsitzandClaude Sonnet 5
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