🔒 Fix potential Path Traversal (ZIP Slip) via unsanitized filename

[paul0728]

🎯 What: A Path Traversal (ZIP Slip) vulnerability in docs/index.html where an unsanitized filename from the input File object was used directly to construct the filename in the generated ZIP file (zip.file(outFileName, ...)).
⚠️ Risk: If a malicious script constructed a File object with path components (e.g., ../../../evil.jpg) or an attacker manipulated the name attribute, the resulting ZIP file could extract files outside the intended directory. This can lead to arbitrary file write on the user's system upon extraction.
🛡️ Solution: Implemented filename sanitization in JavaScript using const sanitizedFileName = file.name.split(/[/\\]/).pop();. This safely strips all / and \ path components, guaranteeing only the base file name is processed before inserting into the ZIP archive. Tested locally using an automated JS test simulation.

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PR created automatically by Jules for task 3122588427105292072 started by @paul0728

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