[bdchatham]

Tempo zone chain IDs for mainnet (4217) and Moderato (42431) use a base offset, but zones of other Tempo chains (devnets, local networks) carry the source chain ID in the high 32 bits: chainId = sourceChainId * 2^32 + zoneId (see zone_chain_id in https://github.com/tempoxyz/tempo/blob/main/crates/zones/primitives/src/constants.rs).

ZoneId.fromChainId subtracted the mainnet base from those IDs, so viem's signAuthorizationToken, which derives the zone ID from chain.id, produced an out-of-range zone ID and threw ("Number ... is not in safe 32-bit unsigned integer range").

This returns the low 32 bits for chain IDs at or above 2^32. Mainnet and Moderato ranges and toChainId are unchanged.

Tested: pnpm test --project tempo-unit src/tempo/ZoneId, lint/format, and type checks.

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