Add Header, InstanceList, and InstanceCard components for instance management UI

ui/src/App.tsx

@@ -1,20 +1,13 @@
-import { Button } from '@/components/ui/button'
-import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+import Header from '@/components/Header'
+import InstanceList from '@/components/InstanceList'
 
 function App() {
   return (
-    <div className="p-8">
-      <h1 className="text-3xl font-bold mb-6">Llamactl Dashboard</h1>
-      
-      <Card className="w-96">
-        <CardHeader>
-          <CardTitle>Sample Instance</CardTitle>
-        </CardHeader>
-        <CardContent>
-          <p className="mb-4">Status: Running</p>
-          <Button>Stop Instance</Button>
-        </CardContent>
-      </Card>
+    <div className="min-h-screen bg-gray-50">
+      <Header />
+      <main className="container mx-auto max-w-4xl px-4 py-8">
+        <InstanceList />
+      </main>
     </div>
   )
 }

ui/src/components/Header.tsx

@@ -0,0 +1,26 @@
+import { Button } from '@/components/ui/button'
+
+function Header() {
+  const handleCreateInstance = () => {
+    // TODO: Open create instance dialog
+    console.log('Create instance clicked')
+  }
+
+  return (
+    <header className="bg-white border-b border-gray-200">
+      <div className="container mx-auto max-w-4xl px-4 py-4">
+        <div className="flex items-center justify-between">
+          <h1 className="text-2xl font-bold text-gray-900">
+            LlamaCtl Dashboard
+          </h1>
+          
+          <Button onClick={handleCreateInstance}>
+            Create Instance
+          </Button>
+        </div>
+      </div>
+    </header>
+  )
+}
+
+export default Header

ui/src/components/InstanceCard.tsx

@@ -0,0 +1,74 @@
+import { Button } from '@/components/ui/button'
+import { Badge } from '@/components/ui/badge'
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+import { Instance } from '@/types/instance'
+import { useInstances } from '@/hooks/useInstances'
+
+interface InstanceCardProps {
+  instance: Instance
+}
+
+function InstanceCard({ instance }: InstanceCardProps) {
+  const { startInstance, stopInstance, deleteInstance } = useInstances()
+
+  const handleStart = () => {
+    startInstance(instance.name)
+  }
+
+  const handleStop = () => {
+    stopInstance(instance.name)
+  }
+
+  const handleDelete = () => {
+    if (confirm(`Are you sure you want to delete instance "${instance.name}"?`)) {
+      deleteInstance(instance.name)
+    }
+  }
+
+  return (
+    <Card>
+      <CardHeader className="pb-3">
+        <div className="flex items-center justify-between">
+          <CardTitle className="text-lg">{instance.name}</CardTitle>
+          <Badge variant={instance.running ? "default" : "secondary"}>
+            {instance.running ? "Running" : "Stopped"}
+          </Badge>
+        </div>
+      </CardHeader>
+      
+      <CardContent>
+        <div className="flex gap-2">
+          {!instance.running ? (
+            <Button 
+              size="sm" 
+              onClick={handleStart}
+              className="flex-1"
+            >
+              Start
+            </Button>
+          ) : (
+            <Button 
+              size="sm" 
+              variant="outline" 
+              onClick={handleStop}
+              className="flex-1"
+            >
+              Stop
+            </Button>
+          )}
+          
+          <Button 
+            size="sm" 
+            variant="destructive" 
+            onClick={handleDelete}
+            disabled={instance.running}
+          >
+            Delete
+          </Button>
+        </div>
+      </CardContent>
+    </Card>
+  )
+}
+
+export default InstanceCard

ui/src/components/InstanceList.tsx

@@ -0,0 +1,56 @@
+import { useInstances } from '@/hooks/useInstances'
+import InstanceCard from '@/components/InstanceCard'
+
+function InstanceList() {
+  const { instances, loading, error } = useInstances()
+
+  if (loading) {
+    return (
+      <div className="flex items-center justify-center py-12">
+        <div className="text-center">
+          <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600 mx-auto mb-4"></div>
+          <p className="text-gray-600">Loading instances...</p>
+        </div>
+      </div>
+    )
+  }
+
+  if (error) {
+    return (
+      <div className="text-center py-12">
+        <div className="text-red-600 mb-4">
+          <p className="text-lg font-semibold">Error loading instances</p>
+          <p className="text-sm">{error}</p>
+        </div>
+      </div>
+    )
+  }
+
+  if (instances.length === 0) {
+    return (
+      <div className="text-center py-12">
+        <p className="text-gray-600 text-lg mb-2">No instances found</p>
+        <p className="text-gray-500 text-sm">Create your first instance to get started</p>
+      </div>
+    )
+  }
+
+  return (
+    <div className="space-y-4">
+      <h2 className="text-xl font-semibold text-gray-900 mb-6">
+        Instances ({instances.length})
+      </h2>
+      
+      <div className="grid gap-4 md:grid-cols-2 lg:grid-cols-3">
+        {instances.map((instance) => (
+          <InstanceCard 
+            key={instance.name} 
+            instance={instance}
+          />
+        ))}
+      </div>
+    </div>
+  )
+}
+
+export default InstanceList

ui/src/components/ui/badge.tsx

@@ -0,0 +1,46 @@
+import * as React from "react"
+import { Slot } from "@radix-ui/react-slot"
+import { cva, type VariantProps } from "class-variance-authority"
+
+import { cn } from "@/lib/utils"
+
+const badgeVariants = cva(
+  "inline-flex items-center justify-center rounded-md border px-2 py-0.5 text-xs font-medium w-fit whitespace-nowrap shrink-0 [&>svg]:size-3 gap-1 [&>svg]:pointer-events-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 transition-[color,box-shadow] overflow-hidden",
+  {
+    variants: {
+      variant: {
+        default:
+          "border-transparent bg-primary text-primary-foreground [a&]:hover:bg-primary/90",
+        secondary:
+          "border-transparent bg-secondary text-secondary-foreground [a&]:hover:bg-secondary/90",
+        destructive:
+          "border-transparent bg-destructive text-white [a&]:hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:focus-visible:ring-destructive/40 dark:bg-destructive/60",
+        outline:
+          "text-foreground [a&]:hover:bg-accent [a&]:hover:text-accent-foreground",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  }
+)
+
+function Badge({
+  className,
+  variant,
+  asChild = false,
+  ...props
+}: React.ComponentProps<"span"> &
+  VariantProps<typeof badgeVariants> & { asChild?: boolean }) {
+  const Comp = asChild ? Slot : "span"
+
+  return (
+    <Comp
+      data-slot="badge"
+      className={cn(badgeVariants({ variant }), className)}
+      {...props}
+    />
+  )
+}
+
+export { Badge, badgeVariants }