Added localStorage support to preserve the selected theme

[DolcePelo]

Description of changes

• Added support for localStorage to persist the selected theme (light/dark) after refreshing the page.
• Modified the ThemeProvider component to save and load the theme from localStorage.
• Used useEffect to load the stored theme when the component mounts.

How to Test Changes

1. Change the theme from the user interface.
2. Refresh the page.
3. Verify that the selected theme persists after the refresh

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[DolcePelo]

i'll wait you to check the changes hope it's useful