fix: resolve E2E workflow instance conflicts and Playwright version issues

Fix chat module to use container's pre-installed Playwright
- Change package.json script from "npx playwright test" to "playwright test"
- Prevents version conflicts between container's Playwright and package.json
- Matches user module pattern which was working correctly

Author: rafal-k

pos-module-chat/package.json

@@ -1,6 +1,6 @@
 {
   "scripts": {
-    "pw-tests": "npx playwright test tests --project=test --reporter=list",
+    "pw-tests": "playwright test tests --project=test --reporter=list",
     "test": "playwright test",
     "install: playwright": "npx playwright install"
   },