feat: add Robinhood Chain (4663) to Cancun supported chains

[fichiokaku]

supportsCancun short-circuits on a hardcoded allowlist and otherwise falls back to checking the latest block for blobGasUsed/excessBlobGas. Arbitrum Orbit chains never expose blob-gas fields in their L2 block headers, so the fallback misdetects them - which is why Arbitrum One (42161) and ApeChain (33139) are already hardcoded. Robinhood Chain (4663) is an Orbit chain with full Cancun support (TSTORE/TLOAD/MCOPY verified on-chain via bytecode-override eth_calls), but without an allowlist entry toNexusAccount rejects any MEE version >= 2.0.0 on it:

MEE version (2.2.1) is not supported for the Robinhood Chain chain. Please use a version earlier than 2.0.0 or a chain that supports Cancun.

With this entry, the full sponsored-supertransaction flow works end to end on Robinhood mainnet (verified against a patched 1.2.4 install: stx 0xe4551f316ae4863faf4b834e7426777bc11a878edf6a37c4481c6d62abbe5e6a, MINED_SUCCESS).

Context: Robinhood Chain went live on the MEE node in v1.4.17 (bcnmy/mee-node#215); the V2_2_1 and current contract suites are deployed there at the canonical addresses.

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PR-Codex overview

This PR updates the Utils.ts file in the src/sdk/account directory by modifying a data structure related to chain support. It adds comments for clarification and includes new entries for specific chains.

Detailed summary

• Added comments explaining support for the Robinhood Chain (Arbitrum Orbit) and its characteristics.
• Introduced a new entry "4663": true to the chain support data structure.
• Retained the entry "5010405": true with a trailing comma for consistency.

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[github-actions]

size-limit report 📦

Path	Size
core (esm)	71.94 KB (-0.04% 🔽)
core (cjs)	87.05 KB (+0.1% 🔺)
bundler (tree-shaking)	7.14 KB (0%)
paymaster (tree-shaking)	543 B (0%)