adds account changed handler

[joshuascan]

📦 Pull Request

Adds onAccountChanged callback to that fires when the user switches wallet accounts and re-authentication completes

✅ Fixed Issues

• Adds onAccountChanged callback

🚨 Test instructions

[Describe any additional context required to test the PR/feature/bug fix.]

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• patch: Bug Fix?
• minor: New Feature?
• major: Breaking Change?
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📦 Published PR as canary version: Canary Versions

✨ Test out this PR locally via:

npm install @magic-ext/wallet-kit@0.6.0-canary.1044.22455768697.0
# or 
yarn add @magic-ext/wallet-kit@0.6.0-canary.1044.22455768697.0

[Copilot]

Pull request overview

Adds a new consumer-facing callback for detecting when a connected wallet account changes and SIWE re-auth completes, wiring it from the React widget down into the extension’s silent re-auth flow.

Changes:

• Add onAccountChanged to MagicWidgetProps.
• Add callback registration (setAccountChangedCallbacks) to WalletKitExtension and invoke it after silent SIWE re-auth.
• Wire the prop into MagicWidget via a useEffect.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
packages/@magic-ext/wallet-kit/src/types.ts	Adds the onAccountChanged prop and docs to the public widget props type.
packages/@magic-ext/wallet-kit/src/extension.ts	Stores account-changed callbacks and triggers them after successful silent SIWE re-auth; adds error callback support.
packages/@magic-ext/wallet-kit/src/MagicWidget.tsx	Registers the new callbacks on the singleton extension instance from React props.

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[Ethella]

🚀 PR was released in @magic-ext/wallet-kit@0.6.0 🚀