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/alert.tsx

@@ -1,7 +1,7 @@
-import * as React from "react"
-import { cva, type VariantProps } from "class-variance-authority"
+import * as React from "react";
+import { cva, type VariantProps } from "class-variance-authority";
 
-import { cn } from "@/lib/utils"
+import { cn } from "@/lib/utils";
 
 const alertVariants = cva(
   "group/alert relative grid w-full gap-0.5 rounded-lg border px-2.5 py-2 text-left text-sm has-data-[slot=alert-action]:relative has-data-[slot=alert-action]:pr-18 has-[>svg]:grid-cols-[auto_1fr] has-[>svg]:gap-x-2 *:[svg]:row-span-2 *:[svg]:translate-y-0.5 *:[svg]:text-current *:[svg:not([class*='size-'])]:size-4",
@@ -16,8 +16,8 @@ const alertVariants = cva(
     defaultVariants: {
       variant: "default",
     },
-  }
-)
+  },
+);
 
 function Alert({
   className,
@@ -31,7 +31,7 @@ function Alert({
       className={cn(alertVariants({ variant }), className)}
       {...props}
     />
-  )
+  );
 }
 
 function AlertTitle({ className, ...props }: React.ComponentProps<"div">) {
@@ -40,11 +40,11 @@ function AlertTitle({ className, ...props }: React.ComponentProps<"div">) {
       data-slot="alert-title"
       className={cn(
         "font-medium group-has-[>svg]/alert:col-start-2 [&_a]:underline [&_a]:underline-offset-3 [&_a]:hover:text-foreground",
-        className
+        className,
       )}
       {...props}
     />
-  )
+  );
 }
 
 function AlertDescription({
@@ -56,11 +56,11 @@ function AlertDescription({
       data-slot="alert-description"
       className={cn(
         "text-sm text-balance text-muted-foreground md:text-pretty [&_a]:underline [&_a]:underline-offset-3 [&_a]:hover:text-foreground [&_p:not(:last-child)]:mb-4",
-        className
+        className,
       )}
       {...props}
     />
-  )
+  );
 }
 
 function AlertAction({ className, ...props }: React.ComponentProps<"div">) {
@@ -70,7 +70,7 @@ function AlertAction({ className, ...props }: React.ComponentProps<"div">) {
       className={cn("absolute top-2 right-2", className)}
       {...props}
     />
-  )
+  );
 }
 
-export { Alert, AlertTitle, AlertDescription, AlertAction }
+export { Alert, AlertTitle, AlertDescription, AlertAction };