[darcszn]

Summary

This PR improves the invoice workflows addressed by #983 and #984:

• Adds a review and confirmation dialog before bulk archive, unarchive, and cancellation operations, including the selected invoice preview.
• Records archive, unarchive, cancel, and undo actions in a bounded local-browser audit trail; archive operations retain their existing undo flow.
• Extends dashboard selection to compare 2-10 invoices against a baseline invoice.
• Adds category and difference filters plus CSV and JSON export for invoice comparisons.
• Connects existing anomaly heuristics and explainable risk scoring to invoice details; labels the output as heuristic rather than trained ML and clarifies false-positive limitations.

Scope notes

• The anomaly/risk work is a heuristic integration only; model training is not included because this repository has no labeled training dataset or training infrastructure.
• This change does not implement marketplace purchasing, community reviews/ratings, licensing, or marketplace analytics. Existing template browsing/import remains as-is; these requirements need a marketplace backend and payment design.
• The bulk audit trail is browser-local, not a server-side durable audit log.

Validation

• git diff --check passed.
• Automated tests and CI were not run, as requested.

Closes #983
Closes #984
closes #985
closes #986

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