feat(react-avatar): expose base hooks and types for Avatar components

[dmytrokirpa]

Summary

• Enables useAvatarBase_unstable hook that was already implemented in useAvatar.tsx but gated behind a comment in index.ts
• Exports AvatarBaseProps and AvatarBaseState types from the package index.ts
• The base hook manages slot structure (root, initials, icon, image slots), ARIA attributes, and image load/error state without design props (size, shape, active, activeAppearance, color)
• useAvatar_unstable delegates to useAvatarBase_unstable and adds design-specific props and the badge slot

Note: renderAvatar_unstable retains AvatarState as its parameter type because AvatarBaseState explicitly omits the badge slot — changing the render signature would require restructuring the component to handle badge externally.

Tracking: #35562

🤖 Generated with Claude Code

[github-actions]

📊 Bundle size report

Package & Exports	Baseline (minified/GZIP)	PR	Change
react-avatar AvatarGroup	17.45 kB 6.995 kB	17.482 kB 7.002 kB	32 B 7 B
react-avatar AvatarGroupItem	61.608 kB 19.326 kB	61.755 kB 19.357 kB	147 B 31 B
react-components react-components: entire library	1.297 MB 324.042 kB	1.297 MB 324.204 kB	626 B 162 B

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
react-avatar Avatar	48.367 kB 15.336 kB
react-components react-components: Button, FluentProvider & webLightTheme	70.397 kB 19.96 kB
react-components react-components: Accordion, Button, FluentProvider, Image, Menu, Popover	236.663 kB 68.729 kB
react-components react-components: FluentProvider & webLightTheme	43.612 kB 14.022 kB
react-persona Persona	55.322 kB 17.279 kB
react-portal-compat PortalCompatProvider	8.386 kB 2.624 kB
react-table DataGrid	159.481 kB 44.953 kB
react-table Table (Primitives only)	40.997 kB 13.172 kB
react-table Table as DataGrid	130.702 kB 35.962 kB
react-table Table (Selection only)	69.089 kB 19.325 kB
react-table Table (Sort only)	67.732 kB 18.942 kB
react-tag-picker @fluentui/react-tag-picker - package	186.596 kB 55.849 kB
react-tags InteractionTag	13.666 kB 5.459 kB
react-tags Tag	29.521 kB 9.389 kB
react-tags TagGroup	82.211 kB 24.143 kB
react-timepicker-compat TimePicker	108.174 kB 35.695 kB
react-tree FlatTree	147.803 kB 42.147 kB
react-tree PersonaFlatTree	149.631 kB 42.53 kB
react-tree PersonaTree	145.691 kB 41.358 kB
react-tree Tree	143.869 kB 40.986 kB

_{🤖 This report was generated against ca8968af85531cc12b0371680a0de44e884dfae0}

[github-actions]

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