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:

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**Performance Opportunities**

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

Start by locating the Chip component and its current public API, then review how children, selection states, icons or avatars, touch targets, and state layers are handled. Compare the existing behavior with the stated Material Design 3 goals and assess the proposed explicit label API. The issue does not name files or tests, and completion criteria remain broad.

Written by the indexing model from the issue text.