fix(public): distinguish unavailable data from empty results and missing pages

src/lib/services/news-list.test.ts

@@ -0,0 +1,30 @@
+import { beforeEach, expect, it, vi } from "vitest";
+
+const state = vi.hoisted(() => ({ fail: false }));
+vi.mock("@/lib/logger", () => ({ logger: { error: vi.fn() } }));
+vi.mock("@/lib/services/news-cache", () => ({
+	cacheNews: async () => {
+		if (state.fail) throw Error("unavailable");
+		return [];
+	},
+}));
+vi.mock("@/lib/db", async () => ({ ...(await import("@/db/schema")), db: {} }));
+
+import { getNewsList } from "./news-list";
+
+beforeEach(() => {
+	state.fail = false;
+});
+it("preserves an empty successful list in strict mode", async () => {
+	expect(await getNewsList(4, { throwOnError: true })).toEqual([]);
+});
+it("lets the homepage distinguish a failed news section", async () => {
+	state.fail = true;
+	await expect(getNewsList(4, { throwOnError: true })).rejects.toThrow(
+		"unavailable",
+	);
+});
+it("preserves the legacy fallback for other callers", async () => {
+	state.fail = true;
+	expect(await getNewsList(4)).toEqual([]);
+});