Soroban Contract Call Helpers (Frontend)

[soomtochukwu]

Description
apps/web/lib/contracts.ts stubs depositEscrow, releaseMilestone, and openDispute. These helpers bridge the UI to the on-chain contracts via Freighter.

Requirements

• Build a Soroban invocation XDR for each contract function using @stellar/stellar-sdk
• Pass XDR to signTransaction() (from stellar.ts); submit signed XDR to Soroban RPC
• Return the confirmed transaction hash
• Display a loading state during submission (handled by the calling component)

Acceptance Criteria

• depositEscrow on Testnet locks USDC and returns a tx hash
• releaseMilestone transitions the escrow job milestone on-chain
• Invalid parameters (e.g. zero amount) throw before submitting a transaction

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[aadviksinghdebug]

@aadviksinghdebug has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

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