Fix model labels and catalog-backed setup initialization

components/model-catalog.ts

@@ -0,0 +1,54 @@
+"use client";
+
+import { useCallback, useEffect, useState } from "react";
+import type { ModelCatalogResponse } from "@/src/core";
+import { onSettingsSaved } from "@/components/settings-signal";
+
+// Shared stale-while-revalidate catalog. Metadata refreshes retain the last
+// good snapshot; connection changes clear selectable models immediately.
+let catalogCache: ModelCatalogResponse | undefined;
+let catalogError = false;
+let catalogInflight: Promise<void> | undefined;
+let catalogGeneration = 0;
+let stopCatalogSignals: (() => void) | undefined;
+const catalogReaders = new Set<() => void>();
+const publishCatalog = () => { for (const reader of catalogReaders) reader(); };
+
+function fetchCatalog(revalidate = false): void {
+	if (revalidate) { catalogGeneration++; catalogInflight = undefined; }
+	if (catalogInflight) return;
+	const generation = catalogGeneration;
+	catalogError = false;
+	publishCatalog();
+	catalogInflight = fetch("/api/models")
+		.then((r) => { if (!r.ok) throw new Error(`catalog request failed: ${r.status}`); return r.json() as Promise<ModelCatalogResponse>; })
+		.then((c) => {
+			if (generation === catalogGeneration) { catalogCache = c; catalogError = false; publishCatalog(); }
+		})
+		.catch(() => {
+			if (generation === catalogGeneration) { catalogError = true; publishCatalog(); }
+		})
+		.finally(() => { if (generation === catalogGeneration) catalogInflight = undefined; });
+}
+
+export function useModelCatalog(): { catalog: ModelCatalogResponse | undefined; failed: boolean; refresh: () => void } {
+	const [snapshot, setSnapshot] = useState(() => ({ catalog: catalogCache, failed: catalogError }));
+	useEffect(() => {
+		const first = catalogReaders.size === 0;
+		const read = () => setSnapshot({ catalog: catalogCache, failed: catalogError });
+		catalogReaders.add(read);
+		if (first) {
+			stopCatalogSignals = onSettingsSaved((section) => {
+				if (section === "keys") {
+					catalogGeneration++; catalogInflight = undefined; catalogCache = undefined;
+					fetchCatalog();
+				} else if (section === "models") fetchCatalog(true);
+			});
+			fetchCatalog(true);
+		} else fetchCatalog();
+		read();
+		return () => { catalogReaders.delete(read); if (!catalogReaders.size) { stopCatalogSignals?.(); stopCatalogSignals = undefined; } };
+	}, []);
+	const refresh = useCallback(() => fetchCatalog(true), []);
+	return { ...snapshot, refresh };
+}