Fix/spinner accessibility 375

[tobiadewola41-eng]

closes #375

Summary

Closes #

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Type of Change

• feat — new feature
• fix — bug fix
• refactor — code change with no behaviour change
• docs — documentation only
• chore — build, deps, config
• contract — Soroban smart contract change

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What Changed.

File	Change

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How to Test

# example
cd server
npm run dev
curl http://localhost:3001/health

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Checklist

General

• Code compiles / builds without errors
• No new TypeScript errors (tsc --noEmit)
• Follows existing code style and patterns
• No secrets, keys, or credentials committed
• .env.example updated if new env vars were added

API changes

• Request/response shapes documented in docs/api-reference.md
• Zod validation added for all request inputs
• Correct HTTP status codes returned
• Auth middleware applied where required

Smart contract changes

• require_auth() called on all state-changing functions
• extend_ttl() called on all new persistent storage entries
• Contract rebuilt with stellar contract build
• Tested on testnet before merge
• docs/smart-contract.md updated
• New contract address added to server/.env.example if redeployed

Database changes

• Migration script included
• Indexes added for queried columns

Docs changes

• Relevant doc in docs/ updated or created
• README updated if structure or setup changed

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Screenshots / Logs

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Notes for Reviewer

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