Add electronic pickles XHS deck generation

[walker1211]

Summary

• Add deterministic deck generation for electronic pickles XHS cards.
• Keep one video topic per card with interaction stats in the badge area.
• Derive publishing metadata for collection, topics, and AI-generated original declaration.

Test plan

• go test ./internal/app ./cmd/mark2note -run 'Electronic|XHS|Publish' -count=1
• go test ./...