Add SwiftUI view tree support

[DjDeveloperr]

Summary

• Publish a reflected SwiftUI logical tree from the Swift inspector agent and surface it as a first-class swiftui hierarchy source.
• Wire the new source through the Rust API, browser selector, and accessibility metadata so the UI can prefer and display it.
• Expand SwiftUI reflection to unwrap ForEach data/content and active conditional branches, and update docs plus the sample integration.

Testing

• swift build --package-path packages/inspector-agent --triple arm64-apple-ios26.0-simulator --sdk "$(xcrun --sdk iphonesimulator --show-sdk-path)"
• npm run --prefix client test
• npm run --prefix client typecheck