Safety-number verification UI

[codebestia]

Description:
Render each contact's safety number (#112), let users mark a contact "verified", and warn prominently when a contact's key set changes (via #118 system events) — "Safety number changed, tap to re-verify". Core anti-MITM UX.

Acceptance criteria:

• Safety number displayed + comparable
• Verified state persisted locally
• Key-change events surface a clear warning

[dee-john]

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

Hi, I'd like to work on this issue! because I am very conversant with solving problems like this!

ℹ️ Repo Maintainers: To accept this application, review their application or assign @dee-john to this issue.

[fairbid01]

@fairbid01 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello maintainer, I would like to work on this issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @fairbid01 to this issue.

[deep-bhikadiya]

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

Hello, this looks like something I can help with. I’ll work on the PR today and share it once it’s ready.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @deep-bhikadiya to this issue.

[Caneryy]

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

Hi maintainer, can I work on this issue?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Caneryy to this issue.

[drips-wave]

Congratulations, @deep-bhikadiya! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @deep-bhikadiya: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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