fix(mui): preserve breadcrumb link styling props

[Chaudharybishal091]

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What is the current behavior?

The MUI Breadcrumb router link renders its content as a plain span, so MUI Link props like underline, color, variant, and sx are not preserved.

What is the new behavior?

The Breadcrumb router link now renders a MuiLink with component="span" inside the router link, preserving MUI link styling props while keeping navigation behavior.

Fixes: N/A

Notes for reviewers

Focused fix for @refinedev/mui Breadcrumb link styling.

[changeset-bot]

🦋 Changeset detected

Latest commit: 678f4fa

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@refinedev/mui	Patch

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