refactor: dark mode for alerts

[patricio0312rev]

[demo] add dark mode to error and success states

Summary

• Background color for spinner's dark mode has been fixed.
• Alert components now supports dark mode for its success and error statuses.

Checklist

• I checked the basic interactions between demo and extension, making sure wallet selection works
• I checked my UI changes against the design and there are no notable differences, including responsiveness
• I checked my (code) changes for obvious issues, debug statements and commented code
• I opened a corresponding card on Clickup for any remaining TODOs in my code
• I added a short description on how to test this PR (if necessary)
• Ready to be merged

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Name	Status	Preview	Updated (UTC)
arkconnect-demo	✅ Ready (Inspect)	Visit Preview	Mar 15, 2024 2:32pm