Improve text visibility in atom and dusk themes

- Add CSS variable support to dusk theme components for dynamic text colors
- Fix low-contrast preset color combinations (cyberpunk, neon, magma, forest, obsidian, space)
- Add text-shadow utility classes and apply to site header and backgrounds
- Style logout buttons as proper buttons matching other button styles
- Fix hardcoded text colors in atom theme components

resources/themes/atom/views/components/form/input.blade.php

@@ -11,7 +11,7 @@
  onblur="this.style.borderColor='var(--input-border-color, var(--color-text-muted))'">
 
 @error($name, $errorBag)
- <p class="mt-1 text-xs italic" style="color: #ef4444;">
+ <p class="mt-1 text-xs italic" style="color: var(--button-danger-color, #ef4444);">
  {{ $message }}
  </p>
 @enderror