fix: top nav height varying by route (flex shrink lock)#87
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Top nav: keep a fixed height across routes
The header sits as the first child in
AppLayout’s column flex stack (height: 100vh,overflow: hidden) above<main>withflexGrow: 1. Flex items default toflex-shrink: 1, so when heavier routes mount, the main area can exert shrink pressure on the header and the bar’s rendered height drifts slightly by route.Change: Treat the header as a fixed-size flex sibling, not a shrinkable one:
flexShrink: 0andflexGrow: 0so<main>cannot compress or stretch the bar.minHeight/maxHeightaligned with the existingheightbreakpoints (xs: 52,md: 56) so the bar stays one locked size.boxSizing: 'border-box'so the bottom border counts inside that height and totals stay consistent.Active vs inactive nav links already both use a 1px bottom border (color only differs), so no link-level style changes were required.