Retry cursor attempt

[shaneauerbach]

Update documentation and OpenAPI specifications for Balances, Activity, and Transactions APIs to include the new warnings field for unsupported chain IDs.

This change reflects a backend update where the API now returns warnings for unsupported numeric chain IDs, allowing partial results for valid chains, rather than returning an error for the entire request. The documentation clarifies this behavior, distinguishing it from errors still returned for invalid chain ID tags.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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