🛡️ Sentinel: Enhance CSP with Trusted Types

[keough99]

🚨 Severity: ENHANCEMENT
💡 Vulnerability: Static applications not dynamically evaluating strings or using unsafe DOM sinks remain theoretically vulnerable to DOM-based XSS if a developer accidentally introduces sinks like innerHTML in the future.
🎯 Impact: Without Trusted Types enforcement, any future introduction of unsafe DOM sinks could expose the application to DOM-based XSS attacks.
🔧 Fix: Enhanced the Content-Security-Policy in all HTML pages by adding require-trusted-types-for 'script'; trusted-types 'none'; to completely block all DOM-based XSS vectors at the browser level.
✅ Verification: Ensure the application loads without CSP errors in the console and test the click-to-copy functionality to verify that assets/main.js operates correctly under the strict DOM sink policies. Automated tests have been executed and confirm functionality.

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PR created automatically by Jules for task 2435000438117912959 started by @keough99

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