feat(wallet): add darkmode/lightmode theme selection logic

[evavirseda]

Description of change

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Links to any relevant issues

fixes #3614

Type of change

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• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

How the change has been tested

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Change checklist

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• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

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[brancoder]

Looks good just some unused imports 🙏

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[brancoder]

LGTM 🎊

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