test: add e2e tests

frontend/playwright.config.ts

@@ -0,0 +1,45 @@
+import { defineConfig, devices } from '@playwright/test';
+import path from 'path';
+
+export default defineConfig({
+	testDir: './e2e',
+
+	// Auto-starts the SvelteKit dev server before E2E tests.
+	// Reuses the existing server if already running (e.g. during active development).
+	// The backend + DB + MinIO must be started separately (see README or CI workflow).
+	webServer: {
+		command: 'npm run dev',
+		url: 'http://localhost:3000',
+		reuseExistingServer: true,
+		timeout: 30_000
+	},
+	fullyParallel: false, // tests share auth state → run sequentially within a worker
+	retries: process.env.CI ? 2 : 0,
+	workers: 1,
+
+	use: {
+		baseURL: process.env.E2E_BASE_URL ?? 'http://localhost:3000',
+		screenshot: 'on', // always capture screenshots
+		video: 'retain-on-failure',
+		trace: 'retain-on-failure'
+	},
+
+	projects: [
+		// 1. Auth setup: logs in and saves the session cookie to disk
+		{
+			name: 'setup',
+			testMatch: /auth\.setup\.ts/
+		},
+		// 2. All E2E tests, re-using the stored session
+		{
+			name: 'chromium',
+			use: {
+				...devices['Desktop Chrome'],
+				storageState: path.join(__dirname, 'e2e/.auth/user.json')
+			},
+			dependencies: ['setup']
+		}
+	],
+
+	outputDir: 'test-results/e2e'
+});