refactor(build): ditched sourcemaps in dist

[CorentinTh]

No description provided.

[Copilot]

Pull Request Overview

This PR removes sourcemap generation from the build process and updates the tsdown build tool to version 0.15.4.

• Removes sourcemap configuration from the tsdown build config
• Updates tsdown dependency from version 0.13.0 to 0.15.4

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
tsdown.config.ts	Removes sourcemap generation settings for both JS and TypeScript declaration files
package.json	Updates tsdown dependency to latest version 0.15.4

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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