Theme Switcher Overhaul

Release digest

Theme Switcher Overhaul 🌓 - High Contrast Mode
- Light Mode: Re-engineered for maximum brightness (stark white/slate) for corporate professionalism.
- Dark Mode: Retained "Monolithic Neon" aesthetic (deep black).
- Adaptive Components: All UI cards (Investors, Security, Unlocks, Community, WhaleFeed) now instantly adapt to theme changes.
- Global Variables: Refactored index.css to use semantic variables (--bg-primary, --glass-bg) for seamless transitions.