chore: Follow up fix textfield design for flutter 3.19.0

lib/config/themes.dart

@@ -89,10 +89,11 @@ abstract class FluffyThemes {
         ),
       ),
       inputDecorationTheme: InputDecorationTheme(
-        border: UnderlineInputBorder(
+        border: OutlineInputBorder(
           borderSide: BorderSide.none,
           borderRadius: BorderRadius.circular(AppConfig.borderRadius / 2),
         ),
+        contentPadding: const EdgeInsets.symmetric(horizontal: 12),
         filled: true,
       ),
       appBarTheme: AppBarTheme(

lib/pages/chat_list/chat_list_header.dart

@@ -50,10 +50,11 @@ class ChatListHeader extends StatelessWidget implements PreferredSizeWidget {
                   onChanged: controller.onSearchEnter,
                   decoration: InputDecoration(
                     fillColor: Theme.of(context).colorScheme.secondaryContainer,
-                    border: UnderlineInputBorder(
+                    border: OutlineInputBorder(
                       borderSide: BorderSide.none,
                       borderRadius: BorderRadius.circular(99),
                     ),
+                    contentPadding: EdgeInsets.zero,
                     hintText: L10n.of(context)!.searchChatsRooms,
                     hintStyle: TextStyle(
                       color: Theme.of(context).colorScheme.onPrimaryContainer,