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/slider.tsx

@@ -1,6 +1,6 @@
-import { Slider as SliderPrimitive } from "@base-ui/react/slider"
+import { Slider as SliderPrimitive } from "@base-ui/react/slider";
 
-import { cn } from "@/lib/utils"
+import { cn } from "@/lib/utils";
 
 function Slider({
   className,
@@ -14,7 +14,7 @@ function Slider({
     ? value
     : Array.isArray(defaultValue)
       ? defaultValue
-      : [min, max]
+      : [min, max];
 
   return (
     <SliderPrimitive.Root
@@ -46,7 +46,7 @@ function Slider({
         ))}
       </SliderPrimitive.Control>
     </SliderPrimitive.Root>
-  )
+  );
 }
 
-export { Slider }
+export { Slider };