Proposes CSS env() support in NativeScript, with the css-env-1 safe-area-inset-* variables filled from the real window insets on iOS and Android.

Rendered

What it covers:

• env() in stylesheets, inline styles, shorthands and JS/TS style writes, following the spec's substitution and fallback rules, and re-evaluated when the insets change.
• overflowSafeArea / overflow-safe-area: one cross-platform switch that hands edges to the author, the NativeScript form of viewport-fit=cover.
• Smart padding: a padding that names its own edge's inset takes that edge over, so it never stacks with the framework's inset on the same view.
• env(ns-safe-area-inset-*) and safe-area-padding for nested pages and frames, where a view cannot know what its ancestors already padded.

Implementation: NativeScript/NativeScript#11449