Add e2e tests

tests/e2e/playwright.config.ts

@@ -0,0 +1,51 @@
+import { defineConfig } from '@playwright/test';
+import path from 'path';
+
+const projectRoot = path.resolve(__dirname, '..', '..');
+const tmpDir = path.resolve(__dirname, '.tmp');
+
+export default defineConfig({
+  testDir: './specs',
+  globalSetup: './global-setup.ts',
+
+  // Radio operations are slow — generous timeouts
+  timeout: 60_000,
+  expect: { timeout: 15_000 },
+
+  // Don't retry — failures likely indicate real hardware/app issues
+  retries: 0,
+
+  // Run tests serially — single radio means no parallelism
+  fullyParallel: false,
+  workers: 1,
+
+  reporter: [['list'], ['html', { open: 'never' }]],
+
+  use: {
+    baseURL: 'http://localhost:8000',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+  },
+
+  projects: [
+    {
+      name: 'chromium',
+      use: { browserName: 'chromium' },
+    },
+  ],
+
+  webServer: {
+    command: 'uv run uvicorn app.main:app --host 127.0.0.1 --port 8000',
+    cwd: projectRoot,
+    port: 8000,
+    reuseExistingServer: false,
+    timeout: 30_000,
+    env: {
+      MESHCORE_DATABASE_PATH: path.join(tmpDir, 'e2e-test.db'),
+      // Pass through the serial port from the environment
+      ...(process.env.MESHCORE_SERIAL_PORT
+        ? { MESHCORE_SERIAL_PORT: process.env.MESHCORE_SERIAL_PORT }
+        : {}),
+    },
+  },
+});