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refactor(appbar): improve MD3 variants and action composition #4934

@ruben-rebelo

Description

@ruben-rebelo

Refactor AppBar 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 support for MD3 top app bar variants
  • Simplify action rendering
  • Improve scroll behavior integration
  • Improve accessibility and semantics

Proposed API Direction

<Appbar variant="small" title="Inbox" actions={[...]} />

Performance Opportunities

  • Reduce action re-renders
  • Improve animated scroll performance
  • Reduce style recalculation

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