refactor(checkbox): improve MD3 behavior and simplify selection API

[ruben-rebelo]

Refactor CheckBox to improve Material Design 3 compliance, remove problematic children patterns, improve performance characteristics, and modernize the public API.

Problems

• Current API relies heavily on children composition in ways that are difficult to optimize
• Internal layout logic is tightly coupled to arbitrary child structures
• MD3 behaviors and visuals are not fully aligned with current Material guidelines
• Rendering performance can degrade in large lists or frequently updated screens
• Type safety and discoverability of the API can be improved
• The component has inconsistent behavior between platforms and edge cases

Focus Areas

• Improve MD3 state layer implementation
• Standardize indeterminate state handling
• Improve accessibility semantics
• Reduce internal animation complexity
• Simplify selection logic

Proposed API Direction
<Checkbox status="checked" onPress={...} />

Performance Opportunities

• Reduce animated state churn
• Avoid unnecessary rerenders
• Improve touch handling efficiency

[adrcotfas]

Important

See #4949 for more details