fix: improve namespace exports

[bmschmidt]

Minor changes oriented around ensuring that we get properly exported types in the bundled package; moving d.ts to .ts, getting rid of the namespace in favor of explicit type exports, etc.

:rocket:	This description was created by Ellipsis for commit ccbf1325c0d4ce601fc65a8cb3ea158eb90527dc

Summary:

Improved namespace exports by replacing global.d.ts with global.ts, updating imports, and renaming openapi.d.ts to openapi.ts.

Key points:

• Replaced src/global.d.ts with src/global.ts to export types as a module.
• Updated imports in src/index.ts, src/organization.ts, src/project.ts, src/user.ts, and src/viewer.ts to use global.ts.
• Renamed src/type-gen/openapi.d.ts to src/type-gen/openapi.ts in package.json and updated imports accordingly.
• Adjusted constructors and function parameters to use AtlasViewer instead of AtlasUser where applicable.

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Generated with :heart: by ellipsis.dev

[bmschmidt]

• #66 👈
• main

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