feat(contractor-onboarding) - show && sign contract

[gabrielseco]

Contractor Onboarding: Contract Preview and Signing Functionality

Summary

This PR adds a new step to the contractor onboarding flow that enables users to preview and sign contracts. It implements a PDF viewer component and integrates contract signing capabilities into the existing flow.

Key Changes

• Added a new "Contract Preview" step to the contractor onboarding flow between Contract Details and Pricing Plan steps
• Implemented a reusable PDF preview component with navigation controls
• Added contract document signature schema and API integration for contract signing
• Integrated PDF viewer libraries (react-pdf and pdfjs-dist) for rendering contract documents

Technical Details

• Used react-pdf and pdfjs-dist for PDF rendering functionality
• Created a PDFPreview component that supports base64-encoded PDF data
• Added signature validation schema to capture legal signatures
• Updated step navigation flow to include the new contract preview step
• Extended API integration to support fetching contract documents and submitting signatures

This enhancement allows users to review their contract and provide a legally binding signature before proceeding to the pricing plan selection.

Caveats

• The PDFViewer could be enhanced later in case users want to customize it
• The signature is saved into the BE but is never retrieved if you have done so before

[github-actions]

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[github-actions]

Deploy preview for remote-flows-example-app ready!

✅ Preview
https://remote-flows-example-oi256o3yq-remotecom.vercel.app

Built with commit 630129f.
This pull request is being automatically deployed with vercel-action

[cammellos]

I suppose we will want to add a e2e test covering the full flow eventually @gabrielseco , but I take you'd like to do that after it's all complete