refactor(button & combobox): enhance styling and accessibility

- Updated button variants for improved hover effects and accessibility, including aria-loading support.
- Refined combobox trigger styles for better visibility and consistency, including adjustments to error state styling and input placeholder appearance.
- Improved overall class management and organization for both components.

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

@@ -5,18 +5,23 @@ import { Loader } from 'lucide-react'
 import * as React from 'react'
 
 const buttonVariants = cva(
-  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-all disabled:pointer-events-none disabled:opacity-50 [&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+  cn(
+    'inline-flex items-center justify-center gap-2 whitespace-nowrap',
+    'rounded-md text-sm font-medium transition-all',
+    'disabled:pointer-events-none disabled:opacity-40',
+    "[&_svg]:pointer-events-none [&_svg:not([class*='size-'])]:size-4 shrink-0 [&_svg]:shrink-0 outline-none focus-visible:border-ring focus-visible:ring-ring/50 focus-visible:ring-[3px] aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive",
+    'aria-loading:cursor-progress aria-loading:opacity-40',
+    'hover:shadow-xs'
+  ),
   {
     variants: {
       variant: {
-        default: 'bg-primary text-primary-foreground hover:bg-primary/90',
-        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 dark:border-input dark:hover:bg-input/50',
+        default: 'bg-primary hover:bg-primary-hover text-white',
+        destructive: 'bg-destructive text-white hover:bg-destructive-hover focus-visible:ring-destructive/20',
+        outline: cn('border border-primary/40 bg-primary/10 text-primary', 'hover:bg-primary/5'),
         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'
+        ghost: 'hover:text-primary-hover text-primary',
+        link: 'text-primary underline-offset-4 hover:underline hover:text-primary-hover'
       },
       size: {
         default: 'min-h-9 px-4 py-2 has-[>svg]:px-3',
@@ -72,6 +77,7 @@ function Button({
       data-slot="button"
       className={cn(buttonVariants({ variant, size, className }))}
       disabled={disabled || loading}
+      aria-loading={loading}
       {...props}>
       {/* asChild mode does not support loading because Slot requires a single child element */}
       {asChild ? (

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

@@ -23,8 +23,7 @@ const comboboxTriggerVariants = cva(
     variants: {
       state: {
         default: 'border-border aria-expanded:border-primary aria-expanded:ring-3 aria-expanded:ring-primary/20',
-        error:
-          'border-destructive ring-2 ring-destructive/20 aria-expanded:border-destructive aria-expanded:ring-destructive/20',
+        error: 'border border-destructive! aria-expanded:ring-3 aria-expanded:ring-red-600/20',
         disabled: 'opacity-50 cursor-not-allowed pointer-events-none'
       },
       size: {
@@ -262,7 +261,9 @@ export function Combobox({
       </PopoverTrigger>
       <PopoverContent className={cn('p-0 rounded-2xs', popoverClassName)} style={{ width: triggerWidth }}>
         <Command>
-          {searchable && <CommandInput placeholder={searchPlaceholder} className="h-9" onValueChange={onSearch} />}
+          {searchable && (
+            <CommandInput placeholder={searchPlaceholder} className="h-9 rounded-none" onValueChange={onSearch} />
+          )}
           <CommandList>
             <CommandEmpty>{emptyText}</CommandEmpty>
             <CommandGroup>