iOS layout & spacing for iPhone — the 8pt grid convention + 4pt sub-grid, real Apple layout numbers (16/20pt system margins, safe-area insets, 44/49/50pt bar heights), the 44pt touch target, building dense low-scroll layouts with LazyVGrid/Grid + GridItem (2-up/3-up rules), SwiftUI's adaptive defaul
iOS layout & spacing for iPhone — the 8pt grid convention + 4pt sub-grid, real Apple layout numbers (16/20pt system margins, safe-area insets, 44/49/50pt bar heights), the 44pt touch target, building dense low-scroll layouts with LazyVGrid/Grid + GridItem (2-up/3-up rules), SwiftUI's adaptive default spacing, and the iOS 26 floating-chrome layout model. Use when laying out any iPhone screen, choos