[Bug]: `<.flash />` without title crashs app at runtime

[nighthawk]

What happened?

If your .swiftui.neex file has this snippet below, it'll crash the app at runtime due to a missing title:

<.flash kind={:info} flash={@flash} />

title is optional according to core_components.swiftui.ex (which is also consistent with the same default component from core_components.ex):

attr :title, :string, default: nil

The crash is in AttributeReference.resolve which has try! even though an error is raised in this case.

Library Version

0.4.0-rc.0

Xcode Version

Version 16.2 (16C5032a)

Swift Version

swift-driver version: 1.115.1 Apple Swift version 6.0.3 (swiftlang-6.0.3.1.10 clang-1600.0.30.1)

On which device or simulator are you running into the problem?

iPad

Target Device Operating System Version

iOS 18.3

Relevant log output