refactor(e2e): organize fixtures by feature

e2e/specs/mock/unlock-message/image-unlock-insufficient-credits.spec.ts

@@ -10,6 +10,10 @@ import {
   signInWithEmailAndOpenChat,
 } from "@e2e/fixtures/test-helpers";
 
+const paidImageOverlayUrl = new RegExp(
+  `/chat\\?image=${paidImageMessageId}$`,
+);
+
 test.beforeEach(async ({ baseURL, context, page }) => {
   await clearBrowserState(context, page, baseURL);
   await mockCoreApis(page, {
@@ -29,7 +33,7 @@ test("user sees insufficient credits when unlocking a paid image from fullscreen
   await expect(paidImageButton).toBeVisible({ timeout: 10_000 });
 
   await paidImageButton.click();
-  await expect(page).toHaveURL(new RegExp(`/chat/image/${paidImageMessageId}$`));
+  await expect(page).toHaveURL(paidImageOverlayUrl);
 
   const lockedImageDialog = page.getByRole("dialog", {
     name: "Locked fullscreen image",