refactor(chip): improve selection model and MD3 compliance

Refactor Chip 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 selected/outlined/filter states
- Improve icon/avatar handling
- Simplify content rendering
- Improve touch target sizing
- Improve state layer implementation

**Proposed API Direction**

Move toward explicit label APIs:

``

**Performance Opportunities**

- Reduce animation overhead
- Avoid child inspection
- Improve memoization
- Simplify icon rendering path