UI fixes and implementation #7may

[nirakarpatel]

• Completed the global migration from 'Moderator' to 'Clan-Chief' across all models, controllers, and UI components.
• Overhauled the Dashboard with personalized time-based greetings and a refined student performance data layout.
• Redesigned the Admin and Clan-Chief Panels to provide role-specific management tools and improved navigation.
• Updated the Navbar to center administrative tabs and improve the overall visual balance of the header.
• Enhanced the Leaderboard and Mock Data to support new academic labels (Branch, Section, Year) and live metrics.
• Expanded Backend Controllers for Clans, Challenges, and Notices to improve data fetching and role validation.
• Added foundational UI structures for the upcoming Missions and Clans pages to support new interactive features.
• Updated Submission Tracking logic to ensure accurate progress monitoring for the newly defined Clan-Chief role.

[vercel]

@nirakarpatel is attempting to deploy a commit to the Sky Ruler's projects Team on Vercel.

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