feat: add SHA-3 hash reporting

[ScryUser]

/claim #2

Summary

• Adds a SHA-3 (Keccak) hash column to the client-side bulk evidence hash table using CryptoJS.SHA3(..., { outputLength: 256 }).
• Includes SHA-3 values in the PDF, Word, CSV, and new Excel hash report exports.
• Adds a lightweight System Console panel that logs each SHA-3 calculation as files are processed.
• Keeps the workflow browser-only and client-side.

Verification

• git diff --check -- index.html passed.
• Extracted the inline <script> block and ran node --check against it successfully.
• This repository is a static single-file app and does not include a package-level test suite.

Advertised bounty: $50 on #2.