style: trim narration comments from recent changes

src/components/ios-install-prompt.tsx

@@ -5,7 +5,6 @@ import { Trans, useLingui } from '@lingui/react/macro'
 import { useAuth } from '@/contexts/auth-context'
 import { useIsMobile } from '@/hooks/use-is-mobile'
 
-// Navbar geometry: 4rem height + 0.5rem margin + its safe-area bottom offset.
 const ABOVE_MOBILE_NAV_OFFSET = 'calc(4.5rem + env(safe-area-inset-bottom, 0px))'
 
 export function IOSInstallPrompt() {
@@ -43,8 +42,6 @@ export function IOSInstallPrompt() {
     ? t`Tap Share → Add to Home Screen`
     : t`Tap Menu (⋮) → Add to Home screen`
 
-  // Navbar renders only under _authed, so a signed-in mobile user on a public
-  // route has no nav to clear.
   const aboveBottomNav = Boolean(user) && isMobile
   const bottomStyle = aboveBottomNav
     ? { bottom: ABOVE_MOBILE_NAV_OFFSET, paddingBottom: '8px' }