Grouped sections via .o_fp_sidebar_section_label, active item gets
mint gradient fill + brand-teal left bar. Below 768px the sidebar
collapses to a fixed slide-in drawer (.o_fp_open class), with
.o_fp_portal_hamburger button + .o_fp_portal_backdrop as siblings.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>