🛡️ Sentinel: [HIGH] Fix XSS vulnerability in email preview

[brycejohnson1417]

🚨 Severity: HIGH
💡 Vulnerability: Used dangerouslySetInnerHTML to render email content which poses an XSS risk.
🎯 Impact: Untrusted email content could execute malicious scripts within our application's origin.
🔧 Fix: Replaced dangerouslySetInnerHTML with a sandboxed iframe using srcDoc and sandbox="allow-popups allow-popups-to-escape-sandbox".
✅ Verification: Verified using local dev server and Playwright visual tests to ensure the email preview renders correctly without script execution privileges.

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PR created automatically by Jules for task 2887567150833781369 started by @brycejohnson1417

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Project	Deployment	Actions	Updated (UTC)
map-app-supabase	Ready	Preview, Comment	Jul 3, 2026 10:46am

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