Add contract and Playwright PR checks

apps/commandboard-web/playwright.config.ts

@@ -0,0 +1,31 @@
+import { defineConfig, devices } from "@playwright/test";
+
+export default defineConfig({
+  testDir: "./e2e",
+  timeout: 30_000,
+  expect: {
+    timeout: 5_000
+  },
+  fullyParallel: true,
+  reporter: process.env.CI ? [["github"], ["list"]] : "list",
+  use: {
+    baseURL: "http://127.0.0.1:5173",
+    trace: "on-first-retry"
+  },
+  projects: [
+    {
+      name: "chromium",
+      use: { ...devices["Desktop Chrome"] }
+    },
+    {
+      name: "mobile-chrome",
+      use: { ...devices["Pixel 7"] }
+    }
+  ],
+  webServer: {
+    command: "npm run dev -- --port 5173",
+    url: "http://127.0.0.1:5173",
+    reuseExistingServer: !process.env.CI,
+    timeout: 30_000
+  }
+});