uploading all the changes

[Codesmith28]

• Refactor Navbar and update theme background color
• Update authentication and user profile functionality
• Remove unused imports in submitLCUsername.ts
• Remove unused code and update UserCol type
• Add useEffect hook to Navbar component and update next-auth user type
• Add loading state to UsrnModal and fix useEffect dependency

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
leetcode-leaderboard	✅ Ready (Inspect)	Visit Preview	Nov 7, 2023 8:43am