Implement Dark Mode Toggle

[adrika-mandal-tech]

This pull request introduces a new feature that allows users to switch between a light and dark theme, enhancing the application's accessibility and user experience. Dark Mode Toggle Button: A new UI element can be added to the header (or a suitable location) that serves as a toggle for dark mode.

@codervivek5 Please assign me this issue

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[codervivek5]

No need to add dark mode feature