Implement chat backend and frontend scaffolding

Expanded chat backend with message reply, edit, delete, and reaction support in consumers and models. Updated routing to use chat_id. Added chat-related view stubs. On the frontend, introduced ChatLayout and ChatPage scaffolding, and routed protected routes through ChatLayout.

backend/social/chat/routing.py

@@ -4,5 +4,5 @@ from django.urls import re_path
 from . import consumers
 
 websocket_urlpatterns = [
-    re_path(r"ws/chat/(?P<room_name>\w+)/$", consumers.ChatConsumer.as_asgi()),
+    re_path(r"ws/chat/(?P<chat_id>\w+)/$", consumers.ChatConsumer.as_asgi()),
 ]