Add SHA-3 hashing support

[Golradreth]

Summary

• add SHA-3-256 hashing with CryptoJS.SHA3 for uploaded evidence files
• display SHA-3-256 alongside MD5 and SHA-256 in the main table
• include SHA-3-256 values in CSV, Excel-compatible XLS, PDF, Word, and EML forensic PDF exports
• add a visible System Console log entry when SHA-3-256 is calculated

Verification

• git diff --check
• Inline script syntax check with Node
• Edge headless verification: uploaded an in-memory evidence.txt, confirmed SHA-3-256 output matches CryptoJS.SHA3, confirmed table header, console log, and export functions exist

/claim #2