Bringing autofill to macOS

Shipped native autofill support on macOS, bringing a previously browser-only experience to the whole operating system.

Placeholder: the platform constraints that made a browser-tested pattern not directly portable to native macOS.

Placeholder: how the feature was adapted to feel like a first-class part of macOS rather than a ported browser extension.

Placeholder: what happened after launch and what was learned from real usage.