Fix: large encrypted payload exceeds contract storage limits

[barry01-hash]

Very large prompts may exceed Soroban entry size limits. Enforce a max payload size client-side and surface a clear error.

[Ebby46]

@Ebby46 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello, pls i will like to work on thus issue

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[NovaLabs4324]

@NovaLabs4324 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, pls can I work on this is issue?

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[ExcelDsigN-tech]

@ExcelDsigN-tech has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

I'm a full-stack developer with hands-on experience across Next.js, Node.js, NestJS, React, and TypeScript, and I also specialize in smart contract development using Rust and Soroban. I build end-to-end, from polished frontends to robust backends to on-chain logic, with a strong focus on clean, maintainable code that works in production, not just in isolation. I communicate progress consistently and keep things fully transparent throughout. I'm confident I can deliver within 12 hours.

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