Add security headers and CSP for hosting #45
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Summary
Testing
Testing plan
npm run dev and load the app in a browser.
Open DevTools Console and confirm no CSP violations on initial load and common flows (login, documents, surveys).
Verify that documents still download from Firebase Storage and profile photos (Google user content) still render.
In the Network tab, confirm response headers include CSP, X-Content-Type-Options, Referrer-Policy, and X-Frame-Options.