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

enabled an automatic merge when all merge checks for d3af1346 pass

merged

mentioned in commit 3b213c16

Thanks

• The logged out view does not have a mobile navigation, making the assignments view impossible to get to.
• In addition to the headers / dates being sticky, the prior version had the navigation bar always visible on desktop. iirc, several people had requested this.

Ah, that should be simple enough. Also I had forgotten that we had assignments visible logged-out :D

assigned to @teal

unassigned @teal