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

[arumes31]

🚨 Severity: HIGH
💡 Vulnerability: DOM-based Cross-Site Scripting (XSS) in toast notifications.
🎯 Impact: Untrusted data from the server or user input injected into showToast via error messages could result in malicious script execution in the browser.
🔧 Fix: Replaced innerHTML usage with document.createElement("span") and safe textContent assignment across all UI template files.
✅ Verification: go test -short ./... and manual review of code changes.

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PR created automatically by Jules for task 7702173080154296137 started by @arumes31

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