simplified loadable state logic by removing connectivity debouncing and inlining indicator helpers; updated error bar visibility and chat list polling behavior

lib/view/pages/files/search/files_search_results.dart

@@ -55,7 +55,7 @@ class FilesSearchResults extends StatelessWidget {
     final showPrimaryLoading = isLoading && !hasContent;
     final showBackgroundLoading = isLoading && hasContent;
     final showErrorScreen = hasError && !hasContent && !isLoading;
-    final showErrorBar = hasError && hasContent && !isLoading;
+    final showErrorBar = hasError && hasContent;
     final showEmpty = !hasContent && !hasError && !isLoading;
 
     final errorMessage = hasError ? errorToUserMessage(controller.serverError) : null;
@@ -65,7 +65,6 @@ class FilesSearchResults extends StatelessWidget {
         LoadableStateErrorBar(
           visible: showErrorBar,
           hasContent: hasContent,
-          loading: isLoading,
           message: errorMessage,
         ),
         // Background loading sits *outside* the result Stack so the linear