Description:

Set up dark/light theme support with Caltech color scheme and install shadcn/ui component library for consistent UI elements across the site.

Tasks:

• Install next-themes for theme management (npm install next-themes)
• Configure CSS variables in src/app/globals.css with Caltech colors
• Initialize shadcn/ui (npx shadcn@latest init)
• Install base shadcn/ui components (Button, Card, Input, Select, Separator)
• Create ThemeProvider in src/app/providers.tsx
• Create ThemeToggle component in src/components/layout/theme-toggle.tsx
• Verify theme switching works correctly in browser