feat: add Playwright UI test for post-with-photo flow

playwright.config.js

@@ -0,0 +1,16 @@
+// @ts-check
+const { defineConfig } = require('@playwright/test');
+
+module.exports = defineConfig({
+    testDir: './tests/ui',
+    globalSetup: './tests/global-setup.js',
+    timeout: 30_000,
+    retries: 0,
+    use: {
+        baseURL: process.env.GRAV_BASE_URL || 'http://localhost:8081',
+        headless: true,
+        screenshot: 'only-on-failure',
+        video: 'off',
+    },
+    reporter: [['line']],
+});