fix(react-icons, mock): keep tabler class when adding className

[GermainBergeron]

Proposed Changes

This pull request improves how the mocked icon components handle the className prop, ensuring that custom classes are merged correctly with default tabler icon classes. The key changes are:

Icon Component Behavior:

• The mocked icon components now accept a className prop and properly combine it with the default tabler icon class, allowing for easier styling and testing.

Testing Enhancements:

• Added a new test to verify that the className prop is handled correctly and that the rendered SVG element includes both the default and custom classes.

Potential Breaking Changes

None

Acceptance Criteria

• The proposed changes are covered by unit tests
• The potential breaking changes are clearly identified
• README.md is adjusted to reflect the proposed changes (if relevant)

[Copilot]

Pull Request Overview

This PR adds support for custom className props in Tabler icon mocks, allowing developers to pass additional CSS classes alongside the default Tabler classes.

Key Changes:

• Extract and handle the className prop explicitly in Tabler icon mocks
• Combine custom classNames with default Tabler classNames using string concatenation
• Add test coverage for className prop handling

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/react-icons/src/mock/index.tsx	Modified TablerIconMock to extract className from props and combine it with the default Tabler className
packages/react-icons/src/mock/index.spec.tsx	Added test case verifying that custom className props are correctly merged with default Tabler classes

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