🛡️ Sentinel: [security improvement] Harden CSP and refactor event handlers

[Shin5hi]

🚨 Severity: MEDIUM
💡 Vulnerability: Potential for form hijacking (defense-in-depth) and insecure event handler pattern.
🎯 Impact: Mitigates risk of unauthorized data exfiltration via injected forms and ensures event handlers cannot be easily clobbered.
🔧 Fix:

• Enhanced CSP with form-action 'none'.
• Refactored inline script to use addEventListener instead of onclick.
• Updated CSP hashes to maintain a hardened security posture.
  ✅ Verification: Successfully verified with a Playwright script ensuring no CSP violations occur during user interactions.

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PR created automatically by Jules for task 8558984807246099185 started by @Shin5hi

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