fix(frontend): resolve stale closure in chatSearch.ts

[leojay-net]

Context

Dechat/dex_with_fiat_frontend/src/lib/chatSearch.ts.

Acceptance criteria

• Root cause is identified and described in the PR body
• A regression test reproduces the bug before the fix and passes after
• No any casts are introduced — pnpm typecheck stays clean
• Error paths surface a user-visible message rather than failing silently
• pnpm test:unit passes

[Mistersmile4585]

@Mistersmile4585 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi maintenaner, I’m a full stack developer with experience in smart contract development and modern web technologies. I’m comfortable navigating existing codebases, understanding project requirements, and following contribution guidelines. I will be glad if this issue is assigned to me.

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[Mercy017]

@Mercy017 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I've shipped over 280 contributions across the ecosystem/platform with a clean review history, also contributed to this project last wave — no abandoned PRs, no back-and-forth delays. I'd like to add this issue to that list.

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[drips-wave]

Congratulations, @Mercy017! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @Mercy017: 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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[Mercy017]

Resolved via PR #1292.

[drips-wave]

This issue has been completed by @Mercy017 as part of the Stellar Wave Program's 7th Wave 🥳

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