chore: Follow up leave abandoned DM room

lib/pages/chat/chat.dart

@@ -165,6 +165,20 @@ class ChatController extends State<Chat> {
     VRouter.of(context).toSegments(['rooms', roomId]);
   }
 
+  void leaveChat() async {
+    final room = this.room;
+    if (room == null) {
+      throw Exception(
+          'Leave room button clicked while room is null. This should not be possible from the UI!');
+    }
+    final success = await showFutureLoadingDialog(
+      context: context,
+      future: room.leave,
+    );
+    if (success.error != null) return;
+    VRouter.of(context).to('/rooms');
+  }
+
   EmojiPickerType emojiPickerType = EmojiPickerType.keyboard;
 
   void requestHistory() async {

lib/pages/chat/chat_view.dart

@@ -298,6 +298,8 @@ class ChatView extends StatelessWidget {
                                           children: [
                                             TextButton.icon(
                                               style: TextButton.styleFrom(
+                                                padding:
+                                                    const EdgeInsets.all(16),
                                                 foregroundColor:
                                                     Theme.of(context)
                                                         .colorScheme
@@ -306,12 +308,16 @@ class ChatView extends StatelessWidget {
                                               icon: const Icon(
                                                 Icons.archive_outlined,
                                               ),
-                                              onPressed: () {},
+                                              onPressed: controller.leaveChat,
                                               label: Text(
                                                 L10n.of(context)!.leave,
                                               ),
                                             ),
                                             TextButton.icon(
+                                              style: TextButton.styleFrom(
+                                                padding:
+                                                    const EdgeInsets.all(16),
+                                              ),
                                               icon: const Icon(
                                                 Icons.chat_outlined,
                                               ),