2647c 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Documentation-only edits (branding/copy/structure) with no runtime code changes; main risk is outdated terminology or links causing reader confusion.

Overview
Updates the Flutter wallet tutorial to rebrand Web3Auth PnP as MetaMask Embedded Wallets (including frontmatter description and throughout the guide) and reorganizes headings into clearer numbered steps.

Adds/adjusts callouts linking to relevant Embedded Wallets docs, tweaks wording for clarity/consistency, and fixes small typos in the included code snippets (e.g., message parameter naming, signature variable, curve spelling).

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Project	Deployment	Actions	Updated (UTC)
metamask-docs	Ready	Preview, Comment	Feb 16, 2026 1:58pm