fix(api): handle encrypted PDFs in NDA PDF processing

[Marfuen]

What does this PR do?

• Fixes #XXXX (GitHub issue number)
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Project	Deployment	Review	Updated (UTC)
app	Ready	Preview, Comment	Jan 2, 2026 8:37pm
portal	Ready	Preview, Comment	Jan 2, 2026 8:37pm

[cursor]

PR Summary

Improves robustness of NDA PDF processing by gracefully handling encrypted inputs.

• Import EncryptedPDFError from pdf-lib
• In watermarkExistingPdf, wrap PDFDocument.load in try/catch; on EncryptedPDFError, log and return original pdfBuffer without watermark; rethrow other errors
• No changes to generateNdaPdf or watermark rendering logic

^{Written by Cursor Bugbot for commit 304e1de. This will update automatically on new commits. Configure here.}

[graphite-app]

Graphite Automations

"Auto-assign PRs to Author" took an action on this PR • (01/02/26)

1 assignee was added to this PR based on Mariano Fuentes's automation.

[claudfuen]

🎉 This PR is included in version 1.72.1 🎉

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