refactor(button & combobox): improve styling and class management

- Adjusted button outline variant for consistency in dark mode styling.
- Removed unnecessary background color from combobox trigger for cleaner appearance.
- Updated comments in the theme CSS file for clarity and consistency.

packages/ui/src/components/primitives/button.tsx

@@ -13,7 +13,7 @@ const buttonVariants = cva(
         destructive:
           'bg-destructive text-white hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60',
         outline:
-          'border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input/30 dark:border-input dark:hover:bg-input/50',
+          'border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:bg-input dark:border-input dark:hover:bg-input/50',
         secondary: 'bg-secondary text-secondary-foreground hover:bg-secondary/80',
         ghost: 'hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50',
         link: 'text-primary underline-offset-4 hover:underline'

packages/ui/src/components/primitives/combobox.tsx

@@ -254,7 +254,7 @@ export function Combobox({
           size={size}
           disabled={disabled}
           style={{ width: triggerWidth }}
-          className={cn(comboboxTriggerVariants({ state, size }), 'bg-white', className)}
+          className={cn(comboboxTriggerVariants({ state, size }), className)}
           aria-expanded={open}
           aria-invalid={error}>
           {renderTriggerContent()}

packages/ui/src/styles/theme.css

@@ -420,7 +420,7 @@
 /* Dark Mode 覆盖 */
 /* ==================== */
 
-@theme dark {
+/* @theme dark {
   --color-background: var(--cs-background);
   --color-foreground: var(--cs-foreground);
   --color-card: var(--cs-card);
@@ -432,7 +432,7 @@
   --color-accent: var(--cs-accent);
   --color-sidebar: var(--cs-sidebar);
   --color-sidebar-accent: var(--cs-sidebar-accent);
-}
+} */
 
 /* ==================== */
 /* Base Styles（可选） */