fix: export getSafeMessageEip712Data in public API

[Sednaoui]

Summary

• Export getSafeMessageEip712Data and related types explicitly in the public API instead of using export *
• Add exports field to package.json to support deep import paths (fixes webpack/Next.js production build failure)
• The function was already bundled but not properly exposed through the type declarations

Changes

1. src/abstractionkit.ts: Changed to explicit named exports for safeMessage module
2. package.json: Added exports field to map deep import paths to main bundle

[Sednaoui]

closing for now until i come back to it..