API docs: Soroban contract client usage

[codebestia]

Write apps/web/docs/api-soroban-client.md documenting lib/soroban.ts and lib/freighter.ts — how the frontend builds/signs/submits Soroban contract invocations via the Freighter wallet, which contract functions it currently calls, and network/RPC configuration.

Acceptance criteria:

• The invocation flow (build transaction → request Freighter signature → submit → await result) is documented step by step
• Every contract function currently invoked from the frontend is listed with which page/component triggers it
• Network configuration (testnet/mainnet RPC endpoints, contract IDs) and how it's set is documented

[Michael997glitch]

@Michael997glitch has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I’ve resolved similar problems in the past and am confident I can implement a clean, efficient fix quickly,if am given the opportunity.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Michael997glitch to this issue.

[Akinyemi04]

@Akinyemi04 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Akinyemi04 to this issue.

[drips-wave]

Congratulations, @Akinyemi04! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @Akinyemi04: 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.

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