DEV: /channel -> /c chat route rename (#19782)

* DEV: Rnemae channel path to just c

Also swap the channel id and channel slug params to be consistent with core.

* linting

* channel_path

* params in wrong order

* Drop slugify helper and channel route without slug

* Request slug and route models through the channel model if possible

* Add client side redirection for backwards-compatibility

Co-authored-by: Joffrey JAFFEUX <j.jaffeux@gmail.com>

plugins/chat/assets/javascripts/discourse/services/chat-notification-manager.js

@@ -57,7 +57,7 @@ export default class ChatNotificationManager extends Service {
 
   @bind
   _pageChanged(path) {
-    this.set("_inChat", path.startsWith("/chat/channel/"));
+    this.set("_inChat", path.startsWith("/chat/c/"));
     if (this._inChat) {
       this._chatPresenceChannel.enter({ onlyWhileActive: false });
       this._corePresenceChannel.leave();

plugins/chat/assets/javascripts/discourse/services/chat.js

@@ -1,4 +1,3 @@
-import slugifyChannel from "discourse/plugins/chat/discourse/lib/slugify-channel";
 import deprecated from "discourse-common/lib/deprecated";
 import userSearch from "discourse/lib/user-search";
 import { popupAjaxError } from "discourse/lib/ajax-error";
@@ -297,8 +296,8 @@ export default class Chat extends Service {
 
       return this.router.transitionTo(
         "chat.channel",
+        channel.slugifiedTitle,
         channel.id,
-        slugifyChannel(channel),
         { queryParams }
       );
     } else {