🔒 Fix Unsafe innerHTML Assignment in background.js

[MarsLuay]

🎯 What: Fixed an "Unsafe innerHTML Assignment" vulnerability in background.js (line 1066).
⚠️ Risk: While clearing an element using innerHTML = '' is generally safe, it invokes the HTML parser unnecessarily and is flagged by security scanners as a potential risk or bad practice. Using innerHTML opens up the theoretical risk of XSS if the string were ever inadvertently non-empty or untrusted data.
🛡️ Solution: Replaced input.innerHTML = ''; with input.textContent = ''; to safely and efficiently clear the input content without invoking the HTML parser. This complies with best practices.

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PR created automatically by Jules for task 448689069705117750 started by @MarsLuay

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