chore: upgrade TypeScript to 6.0.2

[chenjiahan]

Summary

• Upgrade TypeScript to ^6.0.2.
• Replace the root tsconfig.json with the shared NodeNext configuration.
• Validate the change with pnpm build and pnpm test.

Related Links

• https://github.com/microsoft/TypeScript/releases/tag/v6.0.2

[Copilot]

Pull request overview

Upgrades the repository’s TypeScript version and adjusts the root TypeScript compiler configuration to align with NodeNext/ESM usage.

Changes:

• Bump typescript dependency to ^6.0.2 (and update lockfile).
• Update tsconfig.json compiler options (NodeNext module settings, target bump, rootDir/types tweaks).
• Normalize package.json scripts formatting (tabs → spaces).

Reviewed changes

Copilot reviewed 1 out of 3 changed files in this pull request and generated no comments.

File	Description
tsconfig.json	Updates compiler options for TS 6 + NodeNext/ESM settings.
package.json	Bumps TypeScript dependency and normalizes scripts indentation.
pnpm-lock.yaml	Lockfile updates reflecting TypeScript 6.0.2 resolution and peers.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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