🔒 fix(security): resolve XSS vulnerability in account dropdown

[megawron]

🎯 What: Fixed an XSS vulnerability in app.js line ~1172 where dynamic account data was being injected directly into the DOM via innerHTML.
⚠️ Risk: Potential Cross-Site Scripting (XSS) attacks if an attacker can manipulate GitHub user account data (login or avatar_url), executing arbitrary code within the application context.
🛡️ Solution: Replaced the unsafe innerHTML implementation with safe DOM creation methods (document.createElement). Used span.textContent for the account login name and safely set img.src for the avatar URL, effectively neutralizing the XSS vector by treating dynamic input as raw text and properties rather than HTML markup.

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PR created automatically by Jules for task 15440931322762693357 started by @megawron

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