feat: add removable sample vertical contract fixture

src/sample/contract-fixture/sample-resource-page.jsx

@@ -0,0 +1,61 @@
+import { useEffect, useState } from "react";
+
+import { deriveAsyncState } from "../../application/view-models/async-state.js";
+import { AsyncSurface } from "../../presentation/components/async-surface.jsx";
+
+/**
+ * @typedef {{
+ *   loading: boolean,
+ *   resources?: Array<{resourceId: string, title: string, createdAtLabel: string | null}>,
+ *   failure?: import("../../contracts/errors.js").ApiFailure
+ * }} SamplePageState
+ */
+
+/**
+ * @param {{
+ *   facade: ReturnType<typeof import("./sample-facade.js").createSampleFacade>
+ * }} props
+ */
+export function SampleResourcePage({ facade }) {
+  const [result, setResult] = useState(
+    /** @type {SamplePageState} */ ({
+      loading: true,
+      resources: undefined,
+      failure: undefined,
+    }),
+  );
+
+  useEffect(() => {
+    let active = true;
+    void facade.listResources().then((outcome) => {
+      if (!active) return;
+      setResult(
+        outcome.ok
+          ? { loading: false, resources: outcome.value, failure: undefined }
+          : { loading: false, resources: undefined, failure: outcome.error },
+      );
+    });
+    return () => {
+      active = false;
+    };
+  }, [facade]);
+
+  const state = deriveAsyncState({
+    isInitialLoading: result.loading,
+    data: result.resources,
+    failure: result.failure,
+  });
+
+  return (
+    <main>
+      <h1>샘플 리소스</h1>
+      <AsyncSurface state={state}>
+        <ul>
+          {(result.resources ?? []).map((resource) => (
+            <li key={resource.resourceId}>{resource.title}</li>
+          ))}
+        </ul>
+      </AsyncSurface>
+    </main>
+  );
+}