fix: Do not allow empty search server

assets/l10n/intl_en.arb

@@ -1044,6 +1044,7 @@
     "anyoneCanKnock": "Anyone can knock",
     "noOneCanJoin": "No one can join",
     "tryAgain": "Try again",
+    "invalidServerName": "Invalid server name",
     "invited": "Invited",
     "@invited": {
         "type": "text",

lib/pages/chat_list/chat_list.dart

@@ -181,6 +181,9 @@ class ChatListController extends State<ChatList>
           initialText: searchServer,
           keyboardType: TextInputType.url,
           autocorrect: false,
+          validator: (server) => server?.contains('.') == true
+              ? null
+              : L10n.of(context)!.invalidServerName,
         )
       ],
     );
@@ -244,6 +247,12 @@ class ChatListController extends State<ChatList>
     _coolDown = Timer(const Duration(milliseconds: 500), _search);
   }
 
+  void startSearch() {
+    setState(() {
+      isSearchMode = true;
+    });
+  }
+
   void cancelSearch({bool unfocus = true}) {
     setState(() {
       searchController.clear();

lib/pages/chat_list/chat_list_header.dart

@@ -62,9 +62,12 @@ class ChatListHeader extends StatelessWidget implements PreferredSizeWidget {
                             onPressed: controller.cancelSearch,
                             color: Theme.of(context).colorScheme.onBackground,
                           )
-                        : Icon(
-                            Icons.search_outlined,
-                            color: Theme.of(context).colorScheme.onBackground,
+                        : IconButton(
+                            onPressed: controller.startSearch,
+                            icon: Icon(
+                              Icons.search_outlined,
+                              color: Theme.of(context).colorScheme.onBackground,
+                            ),
                           ),
                     suffixIcon: controller.isSearchMode
                         ? controller.isSearching
@@ -80,12 +83,16 @@ class ChatListHeader extends StatelessWidget implements PreferredSizeWidget {
                                   ),
                                 ),
                               )
-                            : TextButton(
+                            : TextButton.icon(
                                 onPressed: controller.setServer,
                                 style: TextButton.styleFrom(
+                                  shape: RoundedRectangleBorder(
+                                    borderRadius: BorderRadius.circular(99),
+                                  ),
                                   textStyle: const TextStyle(fontSize: 12),
                                 ),
-                                child: Text(
+                                icon: const Icon(Icons.edit_outlined, size: 16),
+                                label: Text(
                                   controller.searchServer ??
                                       Matrix.of(context)
                                           .client