🛡️ Sentinel: [HIGH] Fix DOM-based XSS in toast notifications

[arumes31]

🚨 Severity: HIGH
💡 Vulnerability: DOM-based Cross-Site Scripting (XSS) via innerHTML injection in the showToast UI notification component.
🎯 Impact: If an attacker can control the response text of a failed API call (or any message displayed in a toast), they could inject arbitrary HTML and malicious scripts into the administrator's browser context.
🔧 Fix: Refactored showToast across all templates (admin_management.html, excluded.html, settings.html, whitelist.html) to dynamically create a span element and assign the untrusted message to its textContent property, thereby safely encoding any HTML before insertion.
✅ Verification: Code review confirms use of textContent. No test regressions were introduced.

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PR created automatically by Jules for task 2019052428086464859 started by @arumes31

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