fix(extract): restore soft-deleted document on extraction accept

[cpcloud]

Summary

• acceptExistingExtraction now calls EnsureDocumentAlive before persisting extraction data, restoring soft-deleted documents automatically
• UpdateDocumentExtraction uses Unscoped so the update reaches soft-deleted rows as a safety net
• Added store-level tests for EnsureDocumentAlive (alive/deleted/nonexistent) and UpdateDocumentExtraction on soft-deleted docs
• Added app-level tests for accepting extraction on soft-deleted documents with and without shadow operations

closes #769

[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.20%. Comparing base (f9f0968) to head (0c13465).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/app/extraction.go	40.00%	2 Missing and 1 partial ⚠️
internal/data/store.go	66.66%	2 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
internal/app/extraction.go	76.57% <40.00%> (-0.13%)	⬇️
internal/data/store.go	72.52% <66.66%> (+0.44%)	⬆️

... and 4 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.