Add headline-line-through to list items

[simonhamp]

A list row had no way to show a done item with its title struck through. In our todo app benchmark runs, several of the agent runs rebuilt rows by hand from basic elements just to get this.

This adds headline-line-through (also headlineLineThrough, fluent ->headlineLineThrough()). It follows the line-through name that <native:text> already uses for the same decoration. It only affects the headline, which is the title in a todo row. It goes over the wire as headline_line_through. iOS applies .strikethrough() to the headline Text, the same way NativeUITextRenderer does. Android sets TextDecoration.LineThrough on the headline.

Bind it to your state so done and open rows share one tag:

<native:list-item headline="{{ $todo->title }}" :headline-line-through="$todo->done" />

The value goes through FILTER_VALIDATE_BOOLEAN, so a string "false" switches it off instead of counting as truthy. The prop is only sent when the attribute is set, so existing rows go over the wire unchanged.

Testing:

• New tests/ListItemLineThroughTest.php covers the default, both spellings, bound true/false/string/int values and the fluent builder. The full suite passes against nativephp/mobile 4.5.2.
• On an iPhone 17 simulator, a super-native screen with three todo rows showed the two done titles struck through and the open one plain.
• Swift: swiftc -typecheck -wmo over core's NativeRender sources plus this package's resources/ios. The error list is identical to main (all baseline errors from core types outside that folder), and a planted canary in the list item renderer was reported, so the file was checked.
• Kotlin: compileDebugKotlin passes in super-native's Android project with the change cherry-picked onto the macOS renderer branch. I didn't run it on an emulator.

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