style(panel): refine button styles with shadow, active scale, toned-down colors

panel/src/components/ui/button.tsx

@@ -4,15 +4,16 @@ import { cva, type VariantProps } from "class-variance-authority";
 import { cn } from "@/lib/utils";
 
 const buttonVariants = cva(
-  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring disabled:pointer-events-none disabled:opacity-50 [&_svg]:size-4 [&_svg]:shrink-0",
+  "inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-md text-sm font-medium ring-offset-background transition-all duration-150 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 [&_svg]:size-4 [&_svg]:shrink-0 active:scale-[0.97]",
   {
     variants: {
       variant: {
-        default: "bg-primary text-primary-foreground hover:bg-primary/90",
+        default:
+          "bg-primary text-primary-foreground shadow-sm hover:bg-primary/90 hover:shadow",
         destructive:
-          "bg-destructive text-destructive-foreground hover:bg-destructive/90",
+          "bg-destructive text-destructive-foreground shadow-sm hover:bg-destructive/90 hover:shadow",
         outline:
-          "border border-input bg-transparent hover:bg-accent hover:text-accent-foreground",
+          "border border-input bg-transparent shadow-sm hover:bg-accent hover:text-accent-foreground",
         ghost: "hover:bg-accent hover:text-accent-foreground",
       },
       size: {