fix: remove all dark mode styles from shared UI components

Stripped dark: classes from Input, Textarea, Button, and InputField
components. These were causing black/dark backgrounds in modals and
forms across all apps (backoffice, gacha, dimentorin, etc).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

libs/ui/src/molecules/input-field/input-field.tsx

@@ -56,7 +56,7 @@ export const InputField: FC<TInputFieldProps> = ({
       <label
         htmlFor={htmlFor}
         className={cn(
-          'items-start justify-item-start text-start text-neutral-800! dark:text-neutral-300!',
+          'items-start justify-item-start text-start text-neutral-800!',
           sizeClasses[size].label
         )}
       >