build(react): migrate to ESM with explicit file extensions in imports

[mozisan]

📝 Description

Migrate @heroui/react to ESM by adding explicit .js extensions to all relative imports and updating the TS config.
This fixes type resolution for ESM consumers of @heroui/react@alpha.

⛳️ Current behavior (updates)

Currently, while packages/react/package.json specifies "type": "module", the source code and build process are not fully ESM-compliant:

• Source code's import/export statements omit file extensions in from clauses (e.g., from "./button")
• TypeScript configuration uses "moduleResolution": "Bundler", which doesn't enforce extension requirements
• As a result, generated .d.ts files also have import/export statements without file extensions in from clauses

This causes type resolution failures when importing @heroui/react from ESM projects.

🚀 New behavior

• All relative imports now include explicit .js extensions (e.g., from "./button.js")
• Directory imports explicitly reference index.js files (e.g., from "../../utils/index.js")
• TypeScript config updated to use "module": "NodeNext" and "moduleResolution": "NodeNext"
• Generated .d.ts files include .js extensions for proper type resolution

Verification

• pnpm build succeeds
• pnpm lint passes
• pnpm typecheck passes
• Storybook starts successfully

💣 Is this a breaking change (Yes/No):

No

📝 Additional Information

Storybook Files Not Updated

The *.stories.tsx files still use extensionless imports.

I intentionally excluded them from this PR because:

1. Storybook starts successfully with these changes
2. Including Storybook files would significantly expand the PR scope

If the team prefers, I'm happy to include Storybook file updates in this PR or a follow-up.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 470a29b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[vercel]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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