Part 3 — Custom themes, multi-window, and polish

Short summary

An advanced SwiftUI tutorial covering custom theming, multi-window macOS support, field validation, tabular data, and ambient UI polish for a Contacts app. Walks through creating brand-owned light/dark themes using DesignFoundation's DFTheme, wiring them at the scene root, and adding accessibility passes. Targets developers who want to close the gap between prototype and professional-grade app.

• •Create custom DFTheme with brand colors, radius, and typography for light and dark modes
• •Implement macOS multi-window support with WindowGroup and @Environment(.openWindow)
• •Add field validation, editable data grids, alerts, popovers, tooltips, and accessibility labels

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