feat(chat): usage improvements with hooks

1. scroll room messages to the bottom
2. submit message on `enter`

assets/js/app.js

@@ -21,9 +21,17 @@ import "phoenix_html"
 import { Socket } from "phoenix"
 import { LiveSocket } from "phoenix_live_view"
 import topbar from "../vendor/topbar"
+import RoomMessages from "./hooks/RoomMessages"
+import ChatMessageTextarea from "./hooks/ChatMessageTextarea"
+
+const hooks = {
+  ChatMessageTextarea,
+  RoomMessages,
+}
 
 let csrfToken = document.querySelector("meta[name='csrf-token']").getAttribute("content")
 let liveSocket = new LiveSocket("/live", Socket, {
+  hooks,
   longPollFallbackMs: 2500,
   params: {
     _csrf_token: csrfToken,