E2E: derive Clerk origin from publishable key; default test creds

frontend/cypress.config.ts

@@ -1,11 +1,16 @@
 import { defineConfig } from "cypress";
 
 export default defineConfig({
+  env: {
+    NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY: process.env.NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY,
+    // Optional overrides.
+    CLERK_ORIGIN: process.env.CYPRESS_CLERK_ORIGIN,
+    CLERK_TEST_EMAIL: process.env.CYPRESS_CLERK_TEST_EMAIL,
+    CLERK_TEST_OTP: process.env.CYPRESS_CLERK_TEST_OTP,
+  },
   e2e: {
     baseUrl: "http://localhost:3000",
-    video: false,
-    screenshotOnRunFailure: true,
-    specPattern: "cypress/e2e/**/*.cy.{ts,tsx,js,jsx}",
+    specPattern: "cypress/e2e/**/*.cy.{js,jsx,ts,tsx}",
     supportFile: "cypress/support/e2e.ts",
   },
 });