feat(home): 首页改为三列探索网格

lib/pages/home/widgets/home_failure_view.dart

@@ -0,0 +1,36 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+import '../../../core/widgets/catalog_debug_info.dart';
+import '../../../core/widgets/empty_state.dart';
+import '../../../l10n/app_localizations.dart';
+
+/// 首页目录加载失败与重试入口。
+class HomeFailureView extends StatelessWidget {
+  const HomeFailureView({
+    super.key,
+    this.error,
+    required this.onRetry,
+    this.onEditEndpoint,
+  });
+
+  final String? error;
+  final VoidCallback onRetry;
+  final VoidCallback? onEditEndpoint;
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context)!;
+    return EmptyState(
+      icon: Icons.cloud_off_rounded,
+      title: l10n.catalogError,
+      actionLabel: l10n.retry,
+      onAction: onRetry,
+      footer: kDebugMode
+          ? CatalogDebugInfo(error: error, onEditEndpoint: onEditEndpoint)
+          : null,
+    );
+  }
+}