feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

mobile/lib/features/activity/activity_page/status_views.dart

@@ -0,0 +1,186 @@
+part of '../activity_page.dart';
+
+class _LoadingSkeleton extends StatelessWidget {
+  final ScrollController scrollController;
+
+  const _LoadingSkeleton({required this.scrollController});
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView.separated(
+      controller: scrollController,
+      padding: _activityScrollPadding(
+        context,
+        horizontal: Grid.gutter,
+        top: Grid.gutter,
+        bottom: Grid.gutter,
+      ),
+      itemCount: 8,
+      separatorBuilder: (_, _) => const SizedBox(height: Grid.xs),
+      itemBuilder: (context, _) => Row(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Container(
+            width: 36,
+            height: 36,
+            decoration: BoxDecoration(
+              shape: BoxShape.circle,
+              color: context.colors.outlineVariant.withValues(alpha: 0.4),
+            ),
+          ),
+          const SizedBox(width: Grid.twelve),
+          Expanded(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Container(
+                  width: 140,
+                  height: 12,
+                  decoration: BoxDecoration(
+                    color: context.colors.outlineVariant.withValues(alpha: 0.4),
+                    borderRadius: BorderRadius.circular(4),
+                  ),
+                ),
+                const SizedBox(height: Grid.xxs),
+                Container(
+                  width: double.infinity,
+                  height: 10,
+                  decoration: BoxDecoration(
+                    color: context.colors.outlineVariant.withValues(alpha: 0.3),
+                    borderRadius: BorderRadius.circular(4),
+                  ),
+                ),
+                const SizedBox(height: Grid.half),
+                Container(
+                  width: 220,
+                  height: 10,
+                  decoration: BoxDecoration(
+                    color: context.colors.outlineVariant.withValues(alpha: 0.2),
+                    borderRadius: BorderRadius.circular(4),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _EmptySurface extends StatelessWidget {
+  final IconData icon;
+  final String message;
+  final String? detail;
+
+  const _EmptySurface({required this.icon, required this.message, this.detail});
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: Grid.gutter),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(icon, size: Grid.lg, color: context.colors.onSurfaceVariant),
+            const SizedBox(height: Grid.xxs),
+            Text(
+              message,
+              style: context.textTheme.bodyMedium?.copyWith(
+                color: context.colors.onSurfaceVariant,
+              ),
+            ),
+            if (detail != null) ...[
+              const SizedBox(height: Grid.half),
+              Text(
+                detail!,
+                style: context.textTheme.bodySmall?.copyWith(
+                  color: context.colors.onSurfaceVariant,
+                ),
+                textAlign: TextAlign.center,
+              ),
+            ],
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+class _EmptyFilterState extends StatelessWidget {
+  final InboxFilter filter;
+  final bool unreadOnly;
+
+  const _EmptyFilterState({required this.filter, required this.unreadOnly});
+
+  @override
+  Widget build(BuildContext context) {
+    if (unreadOnly) {
+      return _EmptySurface(
+        icon: LucideIcons.mailOpen,
+        message: context.l10n.activityNoUnread,
+        detail: context.l10n.activityUnreadHint,
+      );
+    }
+    final (icon, message) = switch (filter) {
+      InboxFilter.mention => (
+        LucideIcons.atSign,
+        context.l10n.activityNoMentions,
+      ),
+      InboxFilter.thread => (
+        LucideIcons.messageSquare,
+        context.l10n.activityNoThreadReplies,
+      ),
+      InboxFilter.needsAction => (
+        LucideIcons.circleAlert,
+        context.l10n.activityNothingNeedsAction,
+      ),
+      InboxFilter.activity => (
+        LucideIcons.activity,
+        context.l10n.activityNoRecent,
+      ),
+      InboxFilter.agentActivity => (
+        LucideIcons.bot,
+        context.l10n.activityNoAgentUpdates,
+      ),
+      _ => (LucideIcons.bell, context.l10n.activityNoActivity),
+    };
+    return _EmptySurface(icon: icon, message: message);
+  }
+}
+
+class _ErrorView extends StatelessWidget {
+  final Future<void> Function() onRetry;
+
+  const _ErrorView({required this.onRetry});
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Icon(
+            LucideIcons.triangleAlert,
+            size: Grid.lg,
+            color: context.colors.error,
+          ),
+          const SizedBox(height: Grid.xxs),
+          Text(
+            context.l10n.activityLoadFailed,
+            style: context.textTheme.bodyMedium?.copyWith(
+              color: context.colors.onSurfaceVariant,
+            ),
+          ),
+          const SizedBox(height: Grid.xs),
+          FilledButton.icon(
+            onPressed: () => unawaited(onRetry()),
+            icon: const Icon(LucideIcons.refreshCcw, size: 16),
+            label: Text(context.l10n.retry),
+          ),
+        ],
+      ),
+    );
+  }
+}