feat: add SHA-3 (Keccak-256) hashing support to table and exports (resolves #2)

[Mister124x]

Submitted PR for this bounty: #2

/claim #2

Changes Implemented:

• Integrated CryptoJS.SHA3(wordArray, { outputLength: 256 }) into the file hashing queue processor.
• Added SHA-3 (Keccak-256) column to the main forensic evidence table.
• Added calculateSHA3(file) helper for asynchronous hash calculation.
• Updated all forensic report export modules (PDF Hash Report, Word Document .docx, and CSV export) to include the SHA-3 column.
• Verified client-side rendering with clean git diff.