fix(exports): Add ./package.json to publishConfig exports

[EricWardner]

Description

Add "./package.json": "./package.json" to the publishConfig.exports map in packages/react/radix-ui/package.json.

The existing "./*" wildcard pattern intercepts require.resolve('radix-ui/package.json'), causing Node.js to look for ./dist/package.json.mjs instead of the actual file. This breaks tools like Storybook that resolve package.json to read package metadata.

The Node.js docs explicitly recommend exporting ./package.json when using an exports map to avoid breaking changes.

Fixes #3818

[changeset-bot]

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Latest commit: f39c279

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