Reduce initial JS bundle size — code-split Soroban SDK and Chakra UI into separate chunks

[prodbycorne]

Problem

@stellar/stellar-sdk and @chakra-ui/react are imported at the top level in multiple files. The soroban.ts singleton is instantiated on module import (sorobanService.initialize() runs immediately). This means the Stellar SDK — which includes XDR codegen weighing ~400 KB minified — is in the initial JS bundle and blocks the first meaningful paint even for unauthenticated visitors who only want to read the home page or leaderboard.

Expected Behaviour

The Soroban SDK is loaded lazily only when the user initiates a wallet connection or a contract interaction. The farm page renders its skeleton immediately from the Next.js static export without waiting for the SDK.

Acceptance Criteria

• src/lib/soroban.ts is refactored so SorobanService methods import from @stellar/stellar-sdk via dynamic import() inside each method body (or via a lazy initializer pattern) rather than at the module top level
• sorobanService.initialize() is removed from the module level and called lazily on first actual contract call
• @chakra-ui/react server components are split: src/app/layout.tsx only imports the ChakraProvider (which must be 'use client'); it does NOT import individual Chakra components at the layout level
• next build output shows the route / chunk is ≤ 150 KB (first load JS) — measured via @next/bundle-analyzer
• A Lighthouse CI run (GitHub Actions) asserts Performance score ≥ 85 on the home page
• No functionality regressions — all contract calls continue to work after lazy loading

Relevant Files

• src/lib/soroban.ts — dynamic imports inside methods
• src/app/layout.tsx — Chakra provider isolation
• next.config.ts — add @next/bundle-analyzer in development
• .github/workflows/ — add Lighthouse CI step

[abioye-emma]

Hi there, I carefully reviewed the issue details and I’m confident I can deliver a clean and efficient solution.

[grantfox-oss]

🦊 GrantFox — @abioye-emma has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #40)
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