feat(mobile): implement claim token entry and biometric auth with PIN…

[Kaylahray]

feat(mobile): implement claim token entry and biometric auth with PIN fallback
closes #48
closes #46

• add claim token entry screen with manual input and clipboard paste
• add token sanitization, validation, and error messaging
• add loading state and claim lookup service flow
• integrate expo-local-authentication for biometric support
• add biometric setup flow with unsupported-device handling
• add PIN fallback setup and verification for sensitive actions
• add authentication failure/success handling in security flow
• wire app navigation/routes for claim and security screens
• include biometric/pin keys in sensitive storage cleanup
• remove issue-specific tests per request

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