feat: add balance check in deposit wallet action test

[ameya-deshmukh]

Note

Adds balance validations to the deposit test and refactors the wallet deposit action to call client.writeContract, with client types/docs noting deposit contract actions.

• Tests (packages/seismic-viem-tests):
  • Deposit flow: capture initial/final account balances and contract balance; assert contract holds expected deposit and account balance decreased by at least the deposit; return balances in test result.
• SDK Actions (packages/seismic-viem/src/actions/depositContract.ts):
  • Refactor deposit wallet action to call client.writeContract (remove writeContract import).
• Client (packages/seismic-viem/src/client.ts):
  • Update type docs to include deposit, getDepositRoot, and getDepositCount in public client, and deposit in wallet client.

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Bug: Deposit now uses shielded instead of transparent transactions

The change from writeContract(client, {...}) to client.writeContract({...}) alters transaction behavior. The standalone writeContract from viem/actions sends standard (unencrypted) transactions. However, due to the client extension order in client.ts, client.writeContract is the shielded version (from shieldedWalletActions) that encrypts calldata. This means deposits now use encrypted transactions instead of transparent ones, which may not be intended for this deposit contract functionality. The transparent version is available as twriteContract.