Set up Playwright for browser testing

- Playwright config for local browsers (Firefox by default) and Docker Chrome
- docker-compose.chrome.yml for browserless/chrome container (arm64)
- 4 connectivity smoke tests (home, contact, blog pages)
- 3 auth tests (redirect, login, logout) with auth helpers
- Custom fixtures with remote CDP connect support
- Shell scripts for start/stop/full Docker Chrome workflow
- Makefile targets: playwright, playwright-docker, playwright-full

app/assets/package.json

@@ -4,12 +4,17 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "test:e2e": "playwright test --config=../playwright.config.ts",
+    "test:e2e:ui": "playwright test --config=../playwright.config.ts --ui"
   },
   "keywords": [],
   "author": "",
   "license": "ISC",
   "type": "commonjs",
+  "devDependencies": {
+    "@playwright/test": "^1.60.0"
+  },
   "dependencies": {
     "highlight.js": "^11.11.1"
   }