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/dusk/views/components/currency.blade.php

@@ -3,8 +3,8 @@
 <div class="gap-x-3 flex">
     <div class="h-[25px] w-[25px] rounded-full {{ $icon }} outline-offset-[3px]"></div>
 
-    <div class="dark:text-gray-400 flex gap-x-2">
-        <span class="font-semibold dark:text-white">
+    <div class="flex gap-x-2 text-muted">
+        <span class="font-semibold" style="color: var(--color-text);">
             {{ $currency }}
         </span>