The nav still used the ink palette: flat fills, oversized rows, and a
tinted background with no marker for the active route. Adopt the CYBER
treatment from the prototype — a 2px glowing cyan bar on the left of the
active item, hairline borders instead of full-contrast ones, monospace
group labels with wide tracking, and a faint cyan wash at the top of the
rail so it does not read as a dead dark slab.
PageSidebarNav gets the same active treatment as AppSidebar so the
conversation routes do not feel like a different product.
Header height stays at 64px — style-system.test.ts asserts it as a
layout contract.
toor
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