FIX: ensures thread panel closes on escape (#29651)

`chatThreadPane.isOpened` was returning `false` when it should return `true` due to an incorrect matching on the route.

Note that visiting a thread will focus the composer and the first escape will blur the input, only the second will close the panel.

plugins/chat/assets/javascripts/discourse/services/chat-thread-pane.js

@@ -10,7 +10,10 @@ export default class ChatThreadPane extends ChatChannelPane {
   }
 
   get isOpened() {
-    return this.router.currentRoute.name === "chat.channel.thread";
+    return (
+      this.router.currentRoute.name === "chat.channel.thread" ||
+      this.router.currentRoute.name === "chat.channel.thread.index"
+    );
   }
 
   get selectedMessageIds() {

plugins/chat/spec/system/chat/composer/shortcuts/thread_spec.rb

@@ -28,6 +28,14 @@ RSpec.describe "Chat | composer | shortcuts | thread", type: :system do
         expect(side_panel_page).to have_open_thread
       end
     end
+
+    it "closes the thread panel" do
+      chat_page.visit_thread(thread_1)
+      thread_page.composer.cancel_shortcut # ensures we are not focused in the composer
+      page.send_keys(:escape)
+
+      expect(side_panel_page).to have_no_open_thread
+    end
   end
 
   describe "ArrowUp" do