Update UX Design

[kanywst]

[gemini-code-assist]

Summary of Changes

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This pull request introduces a significant refresh of the application's user experience. The changes aim to modernize the visual design, streamline navigation, and enhance the overall usability of the platform. By adopting a new dark theme and a sidebar-driven layout, the application now offers a more intuitive and aesthetically pleasing interface for users to explore and manage issues.

Highlights

• Complete UI/UX Redesign: The entire application user interface has been overhauled, transitioning from a traditional header/footer layout to a modern sidebar-based navigation system. This includes a new visual theme, updated typography, and refined component styling across the board.
• New '2026 Modern Developer Dark Theme': Implemented a fresh dark theme with updated color palettes, background textures, and component-specific styling to provide a more contemporary and cohesive visual experience.
• Homepage and Issues List Revamp: The homepage has been redesigned to feature quick links and a cleaner layout. The issues and saved issues pages now utilize a high-density list view with improved filtering and interaction patterns for better readability and usability.
• Material-UI Integration for Next.js App Router: Updated Material-UI dependencies and integrated @mui/material-nextjs to ensure proper styling and functionality within the Next.js App Router environment.

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[kanywst]

/gemini review

[gemini-code-assist]

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