proofs and branding for flutter tutorial

[m4sterbunny]

Description

proofs/style edits and updates branding to Embedded Wallets from Web3Auth for flutter tutorial

Issue(s) fixed

Fixes #partial2647

Preview

Checklist

• If this PR updates or adds documentation content that changes or adds technical meaning, it has received an approval from an engineer or DevRel from the relevant team.
• If this PR updates or adds documentation content, it has received an approval from a technical writer.

External contributor checklist

• I've read the contribution guidelines.
• I've created a new issue (or assigned myself to an existing issue) describing what this PR addresses.

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Note

Low Risk
Documentation-only changes with minor snippet typo fixes; no production code paths are modified.

Overview
Updates the flutter-wallet.mdx tutorial to reflect MetaMask Embedded Wallets branding (formerly Web3Auth Plug and Play), including updated intro/dashboard terminology and refreshed metadata.

Reorganizes the walkthrough into explicit numbered steps/substeps and adds callout blocks for related docs, while applying small copyedits and code-snippet typo fixes (e.g., signMessage parameter name, signature variable naming, curve spelling).

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Project	Deployment	Actions	Updated (UTC)
metamask-docs	Ready	Preview, Comment	Feb 13, 2026 3:34pm