🛡️ Sentinel: [HIGH] Fix XSS vulnerability in Statistics page

[silidev]

🚨 Severity: HIGH
💡 Vulnerability: DOM-based XSS in Statistics.kt where selectedDeckName was interpolated directly into a JavaScript string without escaping.
🎯 Impact: A malicious deck name (e.g. from a shared deck) could execute arbitrary JavaScript in the context of the Statistics page.
🔧 Fix: Used JSONObject.quote(selectedDeckName) to properly escape the string before inserting it into the JS code.
✅ Verification: Ran StatisticsTest (testPlayDebugUnitTest) and verified it passes. Logic verification: JSONObject.quote ensures the string is a valid JSON string literal, preventing breakout.

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PR created automatically by Jules for task 14964980279173920377 started by @silidev

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