test: playwright end-to-end qa (17 tests, real models)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

playwright.config.ts

@@ -0,0 +1,28 @@
+import { defineConfig, devices } from "@playwright/test";
+import { readFileSync, existsSync, mkdirSync } from "node:fs";
+
+// Playwright does not load Next's .env.local; the E2E run needs the real Jev key and a stable APP_SECRET.
+if (existsSync(".env.local")) for (const line of readFileSync(".env.local", "utf8").split("\n")) {
+  const m = /^([A-Z_]+)=(.*)$/.exec(line.trim());
+  if (m && !process.env[m[1]]) process.env[m[1]] = m[2];
+}
+mkdirSync(".auth", { recursive: true });
+
+export default defineConfig({
+  testDir: "./tests-e2e",
+  fullyParallel: false,             // one SQLite file, one app process
+  workers: 1,
+  retries: 0,
+  timeout: 180_000,                 // real models are slow; say so with a timeout, not with retries
+  reporter: [["list"]],
+  use: { baseURL: "http://localhost:3000", trace: "retain-on-failure" },
+  projects: [
+    { name: "setup", testMatch: /auth\.setup\.ts/ },
+    { name: "chromium", use: { ...devices["Desktop Chrome"] }, dependencies: ["setup"] },
+    // A real model run costs ~40s; the mobile project only needs the layout checks, not a second full run.
+    { name: "mobile", use: { ...devices["Pixel 7"] }, dependencies: ["setup"], testMatch: /responsive\.spec\.ts/ },
+  ],
+  webServer: { command: "npm run dev", url: "http://localhost:3000/api/healthz", reuseExistingServer: true,
+    timeout: 120_000,
+    env: { DATA_DIR: ".playwright-data", APP_SECRET: process.env.APP_SECRET ?? "playwright-secret-value" } },
+});