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🛡️ Sentinel: Add X-XSS-Protection and Cross-Origin-Opener-Policy security headers - #118

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🛡️ Sentinel: Add X-XSS-Protection and Cross-Origin-Opener-Policy security headers#118
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Enhance security by adding defense-in-depth HTTP response headers (X-XSS-Protection and Cross-Origin-Opener-Policy) in firebase.json and documenting this in Sentinel's Journal (.jules/sentinel.md).


PR created automatically by Jules for task 13248618494855844750 started by @amrabed

…to firebase.json

This change enhances the defense-in-depth posture of the application by:
1. Setting X-XSS-Protection to '1; mode=block' to prevent reflected cross-site scripting in legacy browsers.
2. Setting Cross-Origin-Opener-Policy to 'same-origin' to isolate the browsing context from potential cross-origin document-referencing leaks and attacks (e.g., Spectre, XS-Leaks).
Also documents this enhancement in .jules/sentinel.md journal.
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