iOS senior UI polish

Apply this on every visual change. Prefer system SwiftUI over custom chrome.

Diagnose with four levers

A basic screen is not ugly. It is invisible: equal weight, no job, no reach.

1. One job — Say what the screen is for in one sentence. One action leads. Everything else supports.
2. Reach — Primary tap lives in the thumb zone (bottom). Price and CTA travel together. Do not bury the action in the nav bar.
3. Rhythm — Group, space, repeat. Left-aligned scan line. Never center body text. Rows share one beat.
4. Native patterns — NavigationStack, TabView, sheets, List/Form rows. Do not invent mini-website controls people must decode.

Fix hierarchy by ordering, not by deleting features.

Four dials (turn surroundings down first)

Size · Weight · Colour · Space.