Light theme doesn't work well on dark terminals. Replace with
two proven dark palettes. Now 5 themes: Flexoki Dark, Tokyo Night,
Catppuccin Mocha, Nord, Gruvbox.
Flexoki Dark (default), Flexoki Light, Catppuccin Mocha, Nord.
Press T to cycle themes; selection persists in preferences.
All hardcoded colors replaced with theme-driven values.
Dedicated ZebraBg per theme for subtle row striping.
lerko