feat(address-book): remove text block from address safety dialog

[sidmorizon]

Summary

• remove the dialog subtitle in address safety popup
• remove the encrypted storage title/description block
• keep only the allowlist section in the popup content

Testing

• not run (UI text-only change)

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[revan-zhang]

✅ Snyk checks have passed. No issues have been found so far.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.