test(HH-558): complete WebChannel sender display regression matrix (#141)

* chore(agent): baseline — uncommitted work from the local directory

* test(HH-558): cover widget sender display matrix

---------

Co-authored-by: Rogee <rogee@ipao.vip>

deploy/docker/docker-compose.yml

@@ -43,6 +43,14 @@ services:
       - "8025:8025"   # Web UI
     # Reference: Chatwoot docker-compose includes mailhog for email testing
 
+  web-channel-test:
+    image: nginx:alpine
+    container_name: gochat-web-channel-test
+    ports:
+      - "8081:80"
+    volumes:
+      - ./web-channel-test/index.html:/usr/share/nginx/html/index.html:ro
+
   gochat:
     build:
       context: ../..