Resolve @handles in the Vouch and Tip recipient fields

[mericcintosun]

Context. Tip and Quests take a raw G…/C… address. Users think in @handles, which already resolve on-chain via the registry.

Tasks

• Accept @handle input and resolve to an address with registry.resolveHandle.
• Show the resolved address + avatar inline before submit; clear error when unclaimed.
• Keep raw-address input working.

Files: apps/web/src/components/Tip.tsx, apps/web/src/lib/registry.ts.
Acceptance: sending a tip to @handle works end to end.

[Chummy-debug]

@Chummy-debug has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello I can resolve this issue.

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

[drips-wave]

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

🧑‍💻 @Chummy-debug: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊