🛡️ Sentinel: [HIGH] Fix DOM-based XSS in file upload
- Added `_escapeHtml` helper to sanitize user-controlled file name. - Used it to sanitize `file.name` before appending it to `row.innerHTML`. - Applied changes to `frontend/static/js/upload.js`. Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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