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feat(appbar): modernize App bar to MD3 Expressive specification - #5173
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- add medium-flexible (112/136dp) and large-flexible (120/152dp) variants
- deprecate medium and large baseline variants
- restore subtitle support with bodyMedium typography and onSurfaceVariant color
- support titleAlignment ('start' | 'center') across small and flexible modes
- add reactive scroll elevation and collapsing support via useAppbarScrollBehavior
- add support for filled ('contained') and tonal ('contained-tonal') trailing action buttons
- add Appbar.Image component for app bar logos and avatars
- export TopAppBar alias and corresponding types for MD3 modernization
- update unit tests, snapshots, and example showcase
Closes callstack#4973
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Motivation
Modernizes Appbar suite to MD3 Expressive specifications (#4973).
medium-flexible(112/136dp),large-flexible(120/152dp).Appbar.Content(bodyMedium,onSurfaceVariant).useAppbarScrollBehaviorfor elevation & 64dp collapse.Appbar.Image.TopAppBaralias and types.Related issue
Closes #4973
Test plan
yarn test AppbarScreenshots