[LiveComponent] Fix data model radio checkbox

[nullodyssey]

Q	A
Bug fix?	yes
New feature?	no
Deprecations?	no
Documentation?	no
Issues	Fix #3412
License	MIT

Bug Fix: data-model overwrites value on radio/checkbox Twig Components

Issue: When using data-model on a child <TwigComponent> that renders a <input type="radio"> or <input type="checkbox">, the subscriber was unconditionally writing the parent prop's value into $data['value']. This clobbered the explicit value="a" / value="b" option values set by the template author, breaking radio groups, checkbox groups, and boolean checkboxes.

Root cause: DataModelPropsSubscriber::onPreMount() always did $data[$childModel] = $propValue. For data-model="selected", the parser resolves child = 'value', so the prop value blindly overwrote whatever value the template had already set.

Fix: Added three-branch logic in the foreach body:

1. Radio / checkbox group — when value already exists in $data (template author passed an explicit option value like value="b"), preserve it and instead set $data['checked'] by comparing the option value against the parent prop. Supports both scalar (radio) and array (multi-checkbox) props.

2. Boolean checkbox — when type="checkbox" is present in $data but no explicit value was passed, set $data['checked'] directly from the boolean prop. Avoids writing a spurious value attribute entirely.

3. All other inputs — unchanged original behavior ($data[$childModel] = $propValue).

Tests added: Three integration tests covering radio group, checkbox group, and boolean checkbox scenarios, verifying that value attributes are preserved and checked is set correctly.