feat: add initial e2e tests

app/playwright.config.ts

@@ -0,0 +1,20 @@
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  webServer: { command: 'pnpm build && pnpm preview', port: 4173 },
+  testDir: 'e2e',
+  use: {
+    browserName: 'firefox',
+    launchOptions: {
+      firefoxUserPrefs: {
+        // Force WebGL even without a GPU
+        'webgl.force-enabled': true,
+        'webgl.disabled': false,
+        // Use software rendering (Mesa) instead of hardware
+        'layers.acceleration.disabled': true,
+        'gfx.webrender.software': true,
+        'webgl.enable-webgl2': true
+      }
+    }
+  }
+});