Security vulnerabilities and automated fixes for chat widget issues
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A stored Cross-Site Scripting (XSS) vulnerability in `frontend/scripts/chat-widget.js` allowed attackers to inject arbitrary JavaScript by crafting a malicious `sender_name` field, which was interpolated directly into a DOM template string without HTML encoding. The `renderFileContent()` function compounded the risk by also inserting unsanitized `file.name` and `file.url` values into `img`, `span`, and `anchor` elements. The fix applies `AppUtils.escapeHTML()` to every user-controlled value befo