feat: add SHA-3 hashing support, Excel export, and System Console (fixes #2)

[iprasen]

/claim #2
Resolves #2

Summary of Changes

This PR implements full SHA-3 (FIPS 202 / 256-bit) cryptographic hashing support, client-side Excel (.xlsx) export, and an interactive on-page System Console log stream, while preserving 100% client-side privacy.

1. Cryptographic Hashing (SHA-3 / FIPS 202)

• Added CryptoJS.SHA3(wordArray, { outputLength: 256 }).toString() to the evidence processing queue.
• Added calculateSHA3(file) helper utility returning a Promise for standalone export workflows.
• Expanded the Bulk Evidence Hash Reporter table with a dedicated column header: SHA-3 (FIPS 202 / 256-bit) and dynamic .sha3 result cells.

2. Multi-Format Export Support (CSV, Excel, PDF, Word)

• Excel (.xlsx): Integrated SheetJS (xlsx.full.min.js) CDN and implemented downloadSelectedExcel(), creating formatted multi-column spreadsheets with custom column auto-widths. Added the green Excel Report action tile in the dashboard.
• PDF: Updated generateHashPDF() and generateEmailReport() to include the SHA-3 hash in forensic report tables and evidence cover sheets.
• Word (.docx): Updated generateHashWord() table schema to include SHA-3 values.
• CSV: Updated downloadSelectedCSV() to include SHA-3 hashes across both standard hash exports and email forensic reports.

3. Real-Time System Console

• Added a dark-themed forensic terminal panel beneath the evidence table (#systemConsole) with timestamped output.
• Logs events in real-time when SHA-3 hashes are computed and when reports are exported.
• Included an inline Clear Log control (clearConsole()).

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Verification & Testing

Validated locally across 35 automated checks:

=== 1. Checking Dependencies & Styles ===
[PASS] SheetJS CDN included
[PASS] CryptoJS CDN included
[PASS] bg-excel CSS defined

=== 2. Checking Dashboard Buttons ===
[PASS] CSV Report button exists
[PASS] Excel Report button exists
[PASS] Excel Report icon and class
[PASS] Hash PDF button exists
[PASS] Hash Word button exists
[PASS] Email PDF button exists
[PASS] Guide button exists
[PASS] Clear button exists

=== 3. Checking Hash Table Columns ===
[PASS] Table header has SHA-3 column
[PASS] Table header has SHA-256 column
[PASS] Table header has MD5 column
[PASS] Dynamic row contains .sha3 cell

=== 4. Checking System Console Panel ===
[PASS] System Console panel container exists
[PASS] System Console header icon
[PASS] System Console clear button
[PASS] logToConsole function defined
[PASS] clearConsole function defined

=== 5. Checking Cryptographic Logic in Queue ===
[PASS] CryptoJS.SHA3 called with 256-bit outputLength
[PASS] row .sha3 innerText updated
[PASS] SHA-3 calculation logged to console

=== 6. Checking Reports & Exports ===
[PASS] downloadSelectedExcel function defined
[PASS] downloadSelectedExcel builds 5 columns
[PASS] downloadSelectedExcel writes xlsx
[PASS] generateHashPDF includes SHA-3 in head
[PASS] generateHashPDF pushes cells[5]
[PASS] generateHashWord includes SHA-3 header
[PASS] generateHashWord pushes cells[5]
[PASS] generateEmailReport calculates SHA-3
[PASS] generateEmailReport includes SHA-3 in body
[PASS] downloadSelectedCSV includes SHA-3
[PASS] calculateSHA3 helper function defined

=== 7. Node.js Script Syntax Evaluation ===
[PASS] Node.js Function constructor parse test - Syntax validation passed: 0 errors

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ALL 35 CHECKS PASSED SUCCESSFULLY!
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