fix: theme switching when document.startViewTransition is undefined

[kirklin]

Issue: Resolves the problem of the theme not switching correctly when the function is undefined.document.startViewTransition

Proposed changes

Updated theme-switching code to handle scenarios where is not available in the browser environment.document.startViewTransition
Implemented a fallback mechanism to ensure theme changes work consistently across different browsers and environments.
Improved code robustness and compatibility with various platforms.

Types of changes

What types of changes does your code introduce?
Put an x in the boxes that apply

• Bugfix (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 (if none of the other choices apply)

Linked Issues

Link #8

Further comments

How to Test:

Verify the existence of the function in the browser environment.document.startViewTransition
Attempt to switch between different themes and observe the behavior.
Check if the theme changes smoothly without any errors in the browser console.
Test the application on different browsers to ensure compatibility.

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