🛡️ Sentinel: [security improvement] Harden CSP and Referrer policy

[Shin5hi]

🛡️ Sentinel: [security improvement] Harden CSP and Referrer policy

🚨 Severity: MEDIUM (Security Enhancement)

💡 Vulnerability: Information leakage via Referrer headers and overly permissive CSP.

🎯 Impact: Sensitive information could be leaked to third-party sites via the Referrer header, and the application was missing baseline CSP protections for object and base-uri.

🔧 Fix: Added no-referrer meta tag and updated CSP meta tag with object-src 'none'; base-uri 'self';.

✅ Verification:

• Local verification with Playwright confirmed correct tag values and no CSP violations.
• UI verification via screenshot confirmed no regressions in functionality.

Note: This change is under the 50-line limit and focuses on high-impact security headers for static sites.

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PR created automatically by Jules for task 12384427962521840292 started by @Shin5hi

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