Add page for MetaMask Smart Accounts

[alexandratran]

This PR adds a page under "Third-party docs" for MetaMask Smart Accounts.

Audience: Web3 dapp developers
Problem: Understanding and embedding MetaMask Smart Accounts
Discovery: Developers may search for MetaMask in the Arbitrum docs
Document type: Concept
Policy acknowledgment: Agree

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Name	Status	Preview	Updated (UTC)
arbitrum-docs	✅ Ready (Inspect)	Visit Preview	Aug 5, 2025 7:44pm

[alexandratran]

Hi @anegg0! I've signed the CLA. Is there anything else to do to get this PR merged?

[pete-vielhaber]

Hello @alexandratran ! We appreciate the contribution! One thing on the content that is here, is that it's missing the "how to use" a smart account. For third-party docs there should be some guidance on how to use the "thing" we are adding. You can view the contribution guidelines here.

[alexandratran]

Hi @pete-vielhaber! Your contribution guidelines state, in Step 5: "third-party documents must be either Quickstarts, How-tos, or Concepts." My intention was to include a short "Concept" page here, which according to your document type conventions, should "explain what things are and how they work."

The document I added intends to provide a brief explanation of MetaMask Smart Accounts and how they support Arbitrum networks. It then links to our existing quickstart instructions which provides the necessary guidance for using smart accounts. This is similar to some other third-party docs on your site, such as Crossmint and Moralis.

If you prefer that I add more explanation of our product and how it works to make it a more substantial concept page, OR prefer that I replicate our quickstart instructions here for easy visibility, I can do that. Just let me know with a follow-up confirmation – thanks!

[pete-vielhaber]

@alexandratran Good call, I'll do some follow up on the other docs you mentioned (and others). For now, we will merge this; but if you could work on submitting a PR for a how to get started or something along those lines, that would be much appreciated. 🙏