security: add positive verified-host indicator (defence in depth)

[nanaf6203-bit]

Summary

DomainWarningBanner warns users of an unknown host but doesn't show any "verified domain" badge on the legitimate one.

Affected area

src/components/DomainWarningBanner.tsx

Steps to reproduce

Compare how major wallets handle this: a positive confirmation is shown when the user is on the canonical domain.

Expected behaviour

Add an explicit Verified

[davidsoniaudin2-oss]

@davidsoniaudin2-oss has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

you can trust me on this job i can work on it sir

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This issue has been completed by @davidsoniaudin2-oss as part of the Stellar Wave Program's 6th Wave 🥳

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