refactor(hub): migrate dashboard to shadcn components

Replace manual CSS classes with shadcn Card, CardHeader, CardTitle,
CardContent, and Badge components. Remove inline <style> block —
use Tailwind utility classes via shadcn theme tokens. Add Biome
formatting across all components.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/components/ui/empty.tsx

@@ -1,6 +1,6 @@
-import { cva, type VariantProps } from "class-variance-authority"
+import { cva, type VariantProps } from "class-variance-authority";
 
-import { cn } from "@/lib/utils"
+import { cn } from "@/lib/utils";
 
 function Empty({ className, ...props }: React.ComponentProps<"div">) {
   return (
@@ -8,11 +8,11 @@ function Empty({ className, ...props }: React.ComponentProps<"div">) {
       data-slot="empty"
       className={cn(
         "flex w-full min-w-0 flex-1 flex-col items-center justify-center gap-4 rounded-xl border-dashed p-6 text-center text-balance",
-        className
+        className,
       )}
       {...props}
     />
-  )
+  );
 }
 
 function EmptyHeader({ className, ...props }: React.ComponentProps<"div">) {
@@ -22,7 +22,7 @@ function EmptyHeader({ className, ...props }: React.ComponentProps<"div">) {
       className={cn("flex max-w-sm flex-col items-center gap-2", className)}
       {...props}
     />
-  )
+  );
 }
 
 const emptyMediaVariants = cva(
@@ -37,8 +37,8 @@ const emptyMediaVariants = cva(
     defaultVariants: {
       variant: "default",
     },
-  }
-)
+  },
+);
 
 function EmptyMedia({
   className,
@@ -52,7 +52,7 @@ function EmptyMedia({
       className={cn(emptyMediaVariants({ variant, className }))}
       {...props}
     />
-  )
+  );
 }
 
 function EmptyTitle({ className, ...props }: React.ComponentProps<"div">) {
@@ -61,11 +61,11 @@ function EmptyTitle({ className, ...props }: React.ComponentProps<"div">) {
       data-slot="empty-title"
       className={cn(
         "font-heading text-sm font-medium tracking-tight",
-        className
+        className,
       )}
       {...props}
     />
-  )
+  );
 }
 
 function EmptyDescription({ className, ...props }: React.ComponentProps<"p">) {
@@ -74,11 +74,11 @@ function EmptyDescription({ className, ...props }: React.ComponentProps<"p">) {
       data-slot="empty-description"
       className={cn(
         "text-sm/relaxed text-muted-foreground [&>a]:underline [&>a]:underline-offset-4 [&>a:hover]:text-primary",
-        className
+        className,
       )}
       {...props}
     />
-  )
+  );
 }
 
 function EmptyContent({ className, ...props }: React.ComponentProps<"div">) {
@@ -87,11 +87,11 @@ function EmptyContent({ className, ...props }: React.ComponentProps<"div">) {
       data-slot="empty-content"
       className={cn(
         "flex w-full max-w-sm min-w-0 flex-col items-center gap-2.5 text-sm text-balance",
-        className
+        className,
       )}
       {...props}
     />
-  )
+  );
 }
 
 export {
@@ -101,4 +101,4 @@ export {
   EmptyDescription,
   EmptyContent,
   EmptyMedia,
-}
+};