🛡️ Sentinel: [ENHANCEMENT] Enhance Content-Security-Policy with Trusted Types

[keough99]

🚨 Severity: ENHANCEMENT
💡 Vulnerability: The application currently lacks Trusted Types enforcement. While no unsafe DOM sinks (like innerHTML) are currently in use, adding this provides defense-in-depth against future DOM-based XSS vulnerabilities.
🎯 Impact: Prevents attackers from exploiting DOM XSS vulnerabilities if unsafe sinks are introduced in the future.
🔧 Fix: Enhanced the Content-Security-Policy in all HTML files by appending require-trusted-types-for 'script'; trusted-types 'none';.
✅ Verification: Verified the updated CSP meta tag is present in all HTML files and does not break existing functionality.

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PR created automatically by Jules for task 7855179055105031352 started by @keough99

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