fix(mui): prevent nested anchors in ThemedTitle

[07ReuelBodhak]

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Bugs / Features

• Related issue(s) linked
• Tests for the changes have been added
• Docs have been added / updated
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What is the current behavior?

ThemedTitle in @refinedev/mui renders Refine's Link as the outer navigation element and MUI's Link as the inner element.

Since both render as <a> tags by default, the output becomes invalid nested anchor HTML:

<a href="/">
  <a>...</a>
</a>

This causes a React 19 hydration error in Next.js:

<a> cannot be a descendant of <a>
Hydration failed because the server rendered HTML didn't match the client.

What is the new behavior?

The inner MuiLink now renders as a div by using component="div".

This keeps the outer Refine Link responsible for navigation while preventing nested <a> tags.

The resulting HTML is now valid:

<a href="/">
  <div>...</div>
</a>

I verified this with a Next.js 16 + React 19 reproduction app:

• Before the fix: browser console showed the nested <a> error: <a> cannot be a descendant of <a>.
• After the fix: the nested <a> warning no longer appears.
• The title/logo still renders correctly.

Fixes #7418

Notes for reviewers

No docs were added because this is a small internal rendering fix.

No test was added because I could not find an existing targeted test setup for this component. The change was manually verified using the reproduction steps from the linked issue.

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