fix：导航栏交互和UI

lib/features/feed/feed_page.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
-import 'package:shadcn_ui/shadcn_ui.dart';
 
 import '../../data/api/report_data_source.dart';
 import '../../data/content_providers.dart';
@@ -90,9 +89,7 @@ class FeedPage extends HookConsumerWidget {
                 ],
               ),
             ),
-            const SizedBox(height: YantingSpacing.x3),
-            const ShadSeparator.horizontal(),
-            const SizedBox(height: YantingSpacing.x3),
+            const SizedBox(height: YantingSpacing.cardGap),
             if (visible.isEmpty)
               const EmptyState(
                 title: '暂无可推荐的研报解读',
@@ -115,7 +112,7 @@ class FeedPage extends HookConsumerWidget {
                 ),
                 onPlayTap: () => _playFromReport(onPlay, visible.first),
               ),
-              const SizedBox(height: YantingSpacing.x6),
+              const SizedBox(height: YantingSpacing.sectionGap),
               const SectionTitle(title: '最新解读', icon: Icons.chevron_right),
               for (final report in visible.skip(1)) ...[
                 ReportCardWidget(