package.jsonのexportsセクションを整理し、nodeおよびbrowserのエクスポートを明確に定義

[deflis]

This pull request updates the package.json file to refine the module export structure, improving compatibility and clarity for different environments (Node.js, browser, and utilities). The changes reorganize and expand the export mappings to ensure proper handling of import, require, and types fields.

Updates to export mappings in package.json:

• Node.js-specific exports: Introduced a node field under the main export to explicitly define import and require paths for Node.js environments.
• Browser-specific exports: Reorganized the browser field to remove the types field and ensure require and import paths are clearly defined.
• Utility exports: Added a new ./utils/* export mapping to provide explicit paths for types, import, require, and default for utility files.
• Default export reordering: Moved the default field to the bottom of the main export mapping for better readability and logical grouping.
• General cleanup: Removed redundant or misplaced fields, such as duplicate types entries, and ensured consistency across all export mappings.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	79.02%	697 / 882
🔵	Statements	79.02%	697 / 882
🔵	Functions	72.09%	62 / 86
🔵	Branches	92.72%	102 / 110

File Coverage

No changed files found.

Generated in workflow #168 for commit 8025668 by the Vitest Coverage Report Action