🛡️ Sentinel: [CRITICAL] Fix plaintext password storage

[TargetMisser]

🚨 Severity: CRITICAL
💡 Vulnerability: User passwords were stored in plain text in AsyncStorage.
🎯 Impact: If a device is compromised, rooted, or jailbroken, malicious apps could extract plain text passwords.
🔧 Fix: Migrated password storage to a hybrid model. Metadata is stored in AsyncStorage with passwords masked as '***'. The actual passwords are stored individually in SecureStore using dynamic keys (aerostaff_pwd_${id}). Added auto-migration logic for legacy plain-text entries.
✅ Verification: Run npm run typecheck and npx jest --passWithNoTests to ensure build passes. Passwords should be stored securely.

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PR created automatically by Jules for task 3615846709329509795 started by @TargetMisser

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Project	Deployment	Actions	Updated (UTC)
flight-work-app	Ready	Preview, Comment, Open in v0	Apr 21, 2026 1:17am

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