Add Link

[colemancda]

Link("title", destination:) and Link(destination:) { label } — opens a URL outside the app.

No bridge involvement

The whole hop stays out of Swift: the interpreter hands the address to Compose's LocalUriHandler, so the platform picks which app answers it. No callback registered, no bridge entry. The label takes the accent colour (via the existing LocalInheritedColor fold) so it reads as a link, unless something upstream already tinted it — and the open is wrapped in runCatching so a malformed or unhandled address can't crash the app.

Verification

• swift test — 2 new tests, 107 passing: the destination and label emit, no onTap callback is registered (the interpreter opens it itself), and a custom HStack label survives.
• Emulator — tapping "Open swift.org" fired act=android.intent.action.VIEW dat=https://swift.org, and dumpsys confirmed Chrome became the resumed activity. The URL genuinely opened in the browser, not just a logged intent. The custom-label link (icon + text) and the in-sentence link both render correctly.

Scope

http(s) and other app-resolvable schemes go through the system handler. Link doesn't style beyond the accent colour (no underline — Compose Text has it, but SwiftUI's own Link doesn't underline either), and there's no OpenURLAction environment override.