[google-labs-jules]

This change fixes the issue where handleChainId was returning a hardcoded 'bfmeta' string. It now retrieves the currently selected chain ID from the walletStore. A new unit test has been added to verify this behavior.

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PR created automatically by Jules for task 1419737835341673945 started by @Gaubee

[google-labs-jules]

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[Gaubee]

LGTM! 代码变更简洁，修复了硬编码的 chain ID 问题，测试覆盖完整。