Pass the full VisitProposal to registered RouteDecisionHandler instances

[svara]

Pass VisitProposal to route decision handlers

Route decision handlers previously only received the destination location URL, which limited the routing logic apps could implement. This change passes the full VisitProposal instead — giving apps access to the location, visit options, path configuration properties, and parameters so they can build more comprehensive RouteDecisionHandlers.

⚠️ Breaking API changes

• RouteDecisionHandler.matches(location: URL, ...) → matches(proposal: VisitProposal, ...)
• RouteDecisionHandler.handle(location: URL, ...) → handle(proposal: VisitProposal, ...)

Apps with custom RouteDecisionHandler implementations will need to update their signatures. The location is still available via proposal.url.

Notes

• The built-in handlers (app navigation, system navigation, Safari view controller) and their tests have been updated accordingly.
• Router now logs the full proposal (rather than just the location) when a handler matches or when no handler is found.

Mirrors hotwired/hotwire-native-android#203.