AI配置化

lib/pages/assistant/assistant_page.dart

@@ -7,6 +7,8 @@ import '../../api/ai_api.dart';
 import '../../core/network/api_env.dart';
 import '../../models/ai.dart';
 import '../../providers/ai_provider.dart';
+import '../../providers/ai_config_provider.dart';
+import 'ai_config_page.dart';
 import '../../utils/toast.dart';
 import '../../widgets/state_views.dart';
 import '../../widgets/cute_icon.dart';
@@ -105,6 +107,11 @@ class _AssistantPageState extends ConsumerState<AssistantPage> {
               ),
             ),
           ),
+          const SizedBox(width: 8),
+          // 当前用的哪个模型 —— 点一下就能换。
+          // 放在标题旁边而不是藏进菜单里，是因为「刚才那句话怎么答得怪怪的」
+          // 十有八九就是切错了模型，得让它随时可见。
+          Flexible(child: _configChip(context)),
           const Spacer(),
           _iconButton(
             icon: Icons.history,
@@ -121,6 +128,39 @@ class _AssistantPageState extends ConsumerState<AssistantPage> {
     );
   }
 
+  /// 顶栏上的「当前模型」小胶囊
+  Widget _configChip(BuildContext context) {
+    final active = ref.watch(activeAiConfigProvider);
+    final label = active?.name ?? '--';
+
+    return GestureDetector(
+      onTap: () => openAiConfigPage(context),
+      child: Container(
+        padding: const EdgeInsets.symmetric(horizontal: 9, vertical: 4),
+        decoration: BoxDecoration(
+          color: const Color(0xFFFFF3E6),
+          borderRadius: BorderRadius.circular(10),
+        ),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            const Icon(Icons.memory, size: 12, color: Color(0xFFC8956E)),
+            const SizedBox(width: 4),
+            Flexible(
+              child: Text(
+                label,
+                maxLines: 1,
+                overflow: TextOverflow.ellipsis,
+                style: const TextStyle(fontSize: 11.5, color: Color(0xFF8D6E63)),
+              ),
+            ),
+            const Icon(Icons.expand_more, size: 13, color: Color(0xFFBCAAA4)),
+          ],
+        ),
+      ),
+    );
+  }
+
   Widget _iconButton({
     required IconData icon,
     required String tooltip,