feat: Add CardDemo example showcasing various Card component states and configurations

packages/cli/examples/card-demo.tsx

@@ -0,0 +1,80 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { render, Box, Text } from 'ink';
+import { Card } from '../src/ui/components/shared/Card.js';
+import { ToolCallStatus, StreamingState } from '../src/ui/types.js';
+import { StreamingContext } from '../src/ui/contexts/StreamingContext.js';
+
+const CardDemo = () => {
+  return (
+    <StreamingContext.Provider value={StreamingState.Idle}>
+      <Box flexDirection="column" padding={1} gap={1}>
+        <Text bold>Card Component Demo</Text>
+
+        <Box flexDirection="column" gap={1}>
+          <Text color="dim">Default (100% width, Pending status):</Text>
+          <Card title="Full Width Card" status={ToolCallStatus.Pending}>
+            <Text>
+              This is a standard card that takes up the full width of the
+              terminal container by default.
+            </Text>
+          </Card>
+
+          <Text color="dim">Fixed Width (40 characters, Success status):</Text>
+          <Card
+            title="Fixed Width"
+            status={ToolCallStatus.Success}
+            width={40}
+            suffix="v1.0.0"
+          >
+            <Text>This card has a fixed width of 40 characters.</Text>
+          </Card>
+
+          <Text color="dim">Error Status with Prefix:</Text>
+          <Card
+            title="Database Error"
+            status={ToolCallStatus.Error}
+            width={80}
+            showStatusIndicator={true}
+            suffix="Connection Timeout"
+          >
+            <Text>
+              Failed to connect to the production database after 3 attempts.
+            </Text>
+          </Card>
+
+          <Text color="dim">Canceled Status without Prefix:</Text>
+          <Card
+            title="Operation Aborted"
+            status={ToolCallStatus.Canceled}
+            width={80}
+            showStatusIndicator={false}
+          >
+            <Text>The user canceled the long-running task.</Text>
+          </Card>
+
+          <Text color="dim">Executing Status:</Text>
+          <Card
+            title="Applying Changes"
+            status={ToolCallStatus.Executing}
+            width={70}
+          >
+            <Text>
+              Refactoring the codebase to use the new Card component...
+            </Text>
+          </Card>
+        </Box>
+
+        <Box marginTop={1}>
+          <Text color="dim">Press Ctrl+C to exit</Text>
+        </Box>
+      </Box>
+    </StreamingContext.Provider>
+  );
+};
+
+render(<CardDemo />);