Switch to tsup for building the dist

[karlobencic]

• Added tsup as the build tool to replace raw tsc
• Configured tsup to output ES modules with proper directory structure
• Simpler and faster builds
• Better tree-shaking through ES modules
• Cleaner output structure without src directory nesting

[changeset-bot]

🦋 Changeset detected

Latest commit: 2882fe4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@trustnxt/c2pa-ts	Patch

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[cyraxx]

A couple of questions:

• Is prebuild and postbuild called by tsup? Does it ensure postbuild is executed even after a failed build?
• The entire purpose of prebuild and postbuild is to set the current version number in Version.ts – could this be replaced by compile-time variables?
• With clean: true, I think we don't need the rimraf anymore

[karlobencic]

A couple of questions:

• Is prebuild and postbuild called by tsup? Does it ensure postbuild is executed even after a failed build?
• The entire purpose of prebuild and postbuild is to set the current version number in Version.ts – could this be replaced by compile-time variables?
• With clean: true, I think we don't need the rimraf anymore

No, prebuild/postbuild are called by npm, not tsup. This means postbuild won't run if the build fails, I've now made a better approach by removing those scripts and using compile-time variables.

[cyraxx]

The missing prop should go into a separate PR or at least have its own entry in the changeset. The tsup change itself seems fine.