macOS: widget links (linkurl / <link>) open ScriptWidget instead of the URL #48

On macOS, clicking a widget that sets linkurl (or contains a <link url="…">) brings ScriptWidget's window to the front, and the URL itself is never opened. On iOS the same package forwards the link: ScriptWidgetApp's onOpenURL hands anything that is not ScriptWidget's own scheme to DeepLinkManager.openDeepLink, which calls UIApplication.shared.open.

To reproduce

$render(
  <vstack frame="max" linkurl="https://xnu.app/scriptwidget">
    <text>Open the site</text>
  </vstack>
);

Add it to the macOS desktop or Notification Center and click it.

Expected: the URL opens with its default handler, as on iOS.
Actual: ScriptWidget's main window comes forward; nothing else happens.

Cause

WidgetKit delivers widgetURL / Link destinations to the containing app. The iOS app handles them; ScriptWidgetMacApp has no onOpenURL (or application(_:open:)) handler, so on macOS the URL is dropped.

Suggested fix

Mirror the iOS behaviour in macOS/ScriptWidgetMac/App/ScriptWidgetMacApp.swift, e.g.:

WindowGroup {
    // … existing content …
}
.onOpenURL { url in
    guard url.scheme != kDeepLinkDefaultScheme else { return }
    NSWorkspace.shared.open(url)
}

Ideally a forwarded link would not also raise ScriptWidget's window, so the click goes straight to its destination; an NSApplicationDelegate application(_:open:) implementation may suit that better than onOpenURL. (I have not built this — it is from reading the source.)

Related, on iOS

The iOS handler returns early when url.host() is nil, so a link with an empty host such as scriptable:///run/Name (the only form Scriptable accepts) is silently dropped rather than forwarded. Forwarding those too would let a widget open another app's URL scheme regardless of its host convention.

Use case

I render cards in a widget and want a click to open a detailed page for that card (an HTML file on macOS). On iOS the forwarding already works for URLs with a host; on macOS every click lands in the app.

Thanks for ScriptWidget!