fix: replaced contract_address with bridge address where it was mista…

[alicecha]

…kenly token address

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Description:

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[cursor]

PR Summary

Corrects contract_address to reference the bridge contract (using transfer to/from) instead of token addresses or hardcoded values across several bridge flow models.

• Arbitrum Hyperliquid v2: deposits now use to AS contract_address; withdrawals use from AS contract_address
• Ethereum Blast native v1 withdrawals: replace hardcoded bridge address with from AS contract_address
• Ethereum Lighter v1: deposits use to AS contract_address; withdrawals use from AS contract_address

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[alicecha]

cc @hildobby