[Discussion] Add document assembly, save/load config, and unit tests

[bencarver]

Proposal

I'd like to contribute the following enhancements to Signature Packet IDE:

1. Document Assembly Mode — Match executed/signed PDFs to blank signature pages and assemble final documents with auto-matching and manual override
2. Configuration Save/Load — Save/restore entire sessions with bundled PDFs (base64-encoded) for instant restore without re-uploading
3. Unit Tests — Vitest integration with 13 unit tests covering the matching algorithm

Motivation

• Assembly Mode: Completes the signature workflow (extract → assemble)
• Save/Load: Users can pause/resume work without re-uploading documents
• Tests: Provides confidence in the matching algorithm and prevents regressions

Technical Notes

• Uses existing Google Gemini API for executed page analysis
• Matching algorithm: Jaccard similarity-based scoring (50% doc, 35% party, 15% signatory)
• All processing remains in-browser; no server-side changes needed
• Tests use Vitest (zero additional config with Vite)

Would you be open to these additions? I have a working implementation ready in my fork and can open a PR once you've reviewed the approach.

See: https://github.com/bencarver/SignaturePacketIDE