User feedback: the circular toggle floating off the sidebar's right
edge looked tacked-on. Replaced with a flush full-width row above the
user footer (right-aligned 'Collapse <' chip when expanded; centered
chevron when collapsed). Same nav-item hover treatment so it merges
visually with the sidebar palette. The <aside> no longer needs to
host an overhanging button.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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