🛡️ Sentinel: [HIGH] Fix XSS vulnerability in WebView

[TargetMisser]

🚨 Severity: HIGH
💡 Vulnerability: Cross-Site Scripting (XSS) via React Native WebView `injectJavaScript` using string interpolation of external payloads.
🎯 Impact: Potential arbitrary code execution within the WebView context if the image data or its encoding were to contain executable payloads.
🔧 Fix: Replaced `injectJavaScript` string interpolation with `postMessage` passing securely stringified JSON data. Implemented a deterministic 'READY' handshake to ensure the native component only sends the payload when the WebView is prepared to receive it.
✅ Verification: Tested compile via `npm run typecheck` and verified structural replacement in `src/screens/HomeScreen.tsx` and `src/screens/ShiftScreen.tsx`.

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PR created automatically by Jules for task 13651329013231506257 started by @TargetMisser

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Project	Deployment	Actions	Updated (UTC)
flight-work-app	Ready	Preview, Comment, Open in v0	Apr 26, 2026 1:34am

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