feat: added dark/light theme toggle

[Amitjoiya]

Summary

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Fixes # (issue)

Type of Change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Other (please describe):

Testing

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Checklist

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• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

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PR Checklist

• Tests added/updated
• Documentation updated
• Changes follow coding standards
• Commit messages are clear

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