Desktop sidebar can be toggled between full width (w-56/w-64) and
collapsed icon-only mode (w-16). Collapsed state persists in
localStorage. Icons enlarge to w-6 h-6 when collapsed, labels
hidden, v-tooltip shows item names on hover. Group labels replaced
with thin dividers when collapsed. Toggle button pinned at bottom
with ChevronLeft/Right icon. Content area padding animates smoothly
with transition-all duration-300.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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