fix: keep server env out of avatar client bundle

src/lib/format.test.ts

@@ -1,17 +1,10 @@
-import { beforeEach, describe, expect, it, vi } from "vitest";
-
-const envMock = vi.hoisted(() => ({
-	env: {
-		NEXT_PUBLIC_IMAGER_URL: "https://img.example.com" as string | undefined,
-		NEXT_PUBLIC_APP_URL: undefined as string | undefined,
-		IMAGING_UPSTREAM_URL: "https://up.example.com" as string | undefined,
-	},
-}));
-
-vi.mock("@/env", () => envMock);
-
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { avatarImageUrl, excerpt, slugify } from "./format";
 
+afterEach(() => {
+	vi.unstubAllEnvs();
+});
+
 describe("slugify", () => {
 	it("lowercases and hyphenates", () => {
 		expect(slugify("Hello World!")).toBe("hello-world");
@@ -26,7 +19,7 @@ describe("slugify", () => {
 
 describe("avatarImageUrl", () => {
 	beforeEach(() => {
-		envMock.env.NEXT_PUBLIC_IMAGER_URL = "https://img.example.com";
+		vi.stubEnv("NEXT_PUBLIC_IMAGER_URL", "https://img.example.com");
 	});
 
 	it("appends the figure and options", () => {