FIX: Add new chat threads icon and move thread list button to right (#21575)

* DEV: add new thread icon

* FIX: Use new thread icon, fix typo in SVG

UX: move the thread list icon to the right of
the collapse button

---------

Co-authored-by: Martin Brennan <martin@discourse.org>

plugins/chat/assets/javascripts/discourse/components/chat-drawer/header/thread-list-button.hbs

@@ -5,5 +5,5 @@
   class="open-thread-list-btn btn btn-flat"
   {{on "click" this.stopPropagation}}
 >
-  {{d-icon "comments"}}
+  {{d-icon "discourse-threads"}}
 </LinkTo>

plugins/chat/assets/javascripts/discourse/components/chat-full-page-header.hbs

@@ -31,17 +31,6 @@
 
       {{#if (or @channel.threadingEnabled this.site.desktopView)}}
         <div class="chat-full-page-header__right-actions">
-          {{#if @channel.threadingEnabled}}
-            <LinkTo
-              @route="chat.channel.threads"
-              @models={{@channel.routeModels}}
-              title={{i18n "chat.threads.list"}}
-              class="open-thread-list-btn btn btn-flat"
-            >
-              {{d-icon "comments"}}
-            </LinkTo>
-          {{/if}}
-
           {{#if this.site.desktopView}}
             <DButton
               @icon="discourse-compress"
@@ -50,6 +39,17 @@
               @action={{@onCloseFullScreen}}
             />
           {{/if}}
+
+          {{#if @channel.threadingEnabled}}
+            <LinkTo
+              @route="chat.channel.threads"
+              @models={{@channel.routeModels}}
+              title={{i18n "chat.threads.list"}}
+              class="open-thread-list-btn btn btn-flat"
+            >
+              {{d-icon "discourse-threads"}}
+            </LinkTo>
+          {{/if}}
         </div>
       {{/if}}
     </div>