- Implement left sidebar navigation matching Electron app design
- Add dark/light theme support with CSS variables
- Increase default window size to 950x720 for better layout
- Remove duplicate "Preferences" title, keep only macOS native title
- Add glassmorphism effects and smooth animations
- Update color scheme to use VibeTunnel green (#10b981)
- Add team credits in About section
- Improve responsive design for settings cards
- Add theme-aware styling for all UI elements
