1.2.5 Dark Mode, FAQ, Desktop Notifications, and more

[shayanb]

Summary

This PR introduces major UX improvements and new features to enhance the validator
tracking experience, including dark mode support, comprehensive FAQ documentation,
improved notification systems, and various UI/UX enhancements.

Key Features Added

🌙 Dark Mode Support
📚 FAQ Section
🔔 Enhanced Notification System

• Desktop Notifications: Complete overhaul with proper system integration
  • Retro-style 8-bit notification sounds with subtle volume envelopes

🎯 Sync Committee Enhancements

• Fixed Critical Bug: Sync committee tracked validator count now displays correctly
• Visual Improvements: Tracked validators properly highlighted with assigned colors in
  sync committee modal

🎨 UI/UX Improvements

• Footer Redesign:
• Dashboard Mode: Button relocated to footer center for better UX

🔧 Technical Improvements

• Better error handling and user feedback systems
• Cleaned up debugging code and console output