🛡️ Sentinel: [HIGH] Fix Clickjacking Vulnerability via Frame-Busting

[ImChong]

🚨 Severity: HIGH
💡 Vulnerability: The application was vulnerable to clickjacking. It relies on <meta> tags for its Content-Security-Policy, but browsers ignore the frame-ancestors directive when delivered this way. This allowed the site to be framed by malicious actors.
🎯 Impact: Attackers could embed the site in an iframe to trick users into interacting with the application unintentionally (e.g., clicking hidden buttons).
🔧 Fix: Added a JavaScript frame-busting snippet to js/theme-init.js which executes early on page load. If the page detects it's not the top-level window, it redirects the top-level window to itself.
✅ Verification: Ran npm run check to ensure formatting and linting pass. Verified the code was properly inserted into theme-init.js.

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PR created automatically by Jules for task 3819683403028586314 started by @ImChong

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