Replace the sidebar brand-row collapse control with a floating border toggle.\n\n- Remove the empty sidebar brand shell and keep the collapse control reachable in both expanded and rail modes.\n- Style the collapse button as a floating affordance on the sidebar edge.\n- Cover the missing brand shell, accessible toggle labels, pressed state, and persisted collapsed state in sidebar tests.\n- Update dashboard documentation to describe the border-mounted toggle.\n\nFiles changed:\n docs/dashboard-guide.md | 2 +-\n .../dashboard/app/components/LeftSidebarNav.css | 30 +++++++++++-----------\n .../dashboard/app/components/LeftSidebarNav.tsx | 28 ++++++++++----------\n .../components/__tests__/LeftSidebarNav.test.tsx | 27 +++++++++++++++++++\n 4 files changed, 56 insertions(+), 31 deletions(-)
Fusion-Task-Id: FN-6801
Fusion-Task-Lineage: e1384565-c0cc-4564-b556-f5b74a501c41
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