Implement mobile view improvements

• Add responsive navigation with mobile hamburger menu for both main and admin layouts
• Tables now have horizontal scrolling on small screens
• Fix stage layout to scroll horizontally on mobile devices
• Create responsive dashboard tiles that adapt to smaller screens
• Add sticky headers with proper z-index for better mobile navigation
• Fix dark mode text and background colors for better contrast
• Optimize header components with consistent mobile-friendly classes
• Remove redundant prefix "Admin:" from page titles to save space
• Add JavaScript for mobile navigation menu functionality