feat: implement comprehensive dark mode support

[yllenfer]

✨ Features:

• Add dark mode toggle button with sun/moon icons
• Implement theme persistence using next-themes
• Add smooth transitions between light and dark themes

🎨 UI Improvements:

• Update all hardcoded colors to use theme-aware Tailwind classes
• Fix font visibility in dark mode across all components
• Add dark:invert class to all SVG icons for proper contrast
• Update loading animations and skeleton states for dark mode

🔧 Components Updated:

• TopMenu: Added theme toggle and updated button colors
• CustomSpinner: Fixed loading animation visibility
• Resume components: Updated all text and background colors
• Form components: Updated input and button styling
• Footer: Updated links and icon colors

🖼️ Icons Fixed:

• Logo, GitHub, footer icons with dark:invert
• Sparkle icons in upload and generate buttons
• Site live and upload PDF icons

📱 Features:

• System theme preference detection
• Theme persistence across sessions
• Print-friendly resume (stays white for printing)
• No theme flash on page load

[vercel]

@yllenfer is attempting to deploy a commit to the Together AI Team on Vercel.

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