Replace the Typst/ImageMagick studio with a SwiftPM executable that composes
each marketing screen as a SwiftUI view and renders it headlessly via
ImageRenderer to exact 1284x2778 PNGs.
- Devices are a real iPhone 17 Pro Max .usdz textured + posed in SceneKit
(graphite body, studio IBL); screen curvature/bezel are the model's geometry.
- Per-screen layouts (pose, globe, route arc, encryption flow) in ScreenSpec.
- send-anywhere: globe + Paris->LA route arc; uses the app's share screen.
- stay-private: converging beams -> glowing padlock -> binary protection stream,
with localized CHIFFREMENT/PROTECTION banners and an auto-sizing header panel.
- Captions auto-shrink per locale (ViewThatFits) so long translations never clip.
- Screenshots are transient (generated/shots, git-ignored), captured per locale;
generate.sh does capture + composite in one shot.
- Commit the .usdz model (CC BY 4.0, see assets/ATTRIBUTION.md) and globe asset.
- Remove the superseded Typst pipeline (screens.typ, build.sh, frame.sh, warp.sh).
Track the Affinity design master (AppStore.af) with Git LFS to keep repo
history lean, and ignore the large exported JPG screenshots (regenerated from
the source) plus macOS/editor junk.
