feat(chat): handle retry SSE event

src/api.ts

@@ -541,6 +541,7 @@ export interface StreamEvents {
   onMeta?: (data: any) => void;
   onReasoningDelta?: (text: string) => void;
   onDelta?: (text: string) => void;
+  onRetry?: (data: any) => void;
   onToolCall?: (data: { id: string; name: string; args: any }) => void;
   onToolResult?: (data: { id: string; name: string; result: any }) => void;
   onDone?: (data: { user: ChatMessage; assistant: ChatMessage }) => void;
@@ -641,6 +642,9 @@ async function consumeSSE(resp: Response, h: StreamEvents, signal?: AbortSignal)
           case 'meta':
             h.onMeta?.(data);
             break;
+          case 'retry':
+            h.onRetry?.(data);
+            break;
           case 'reasoning_delta':
             h.onReasoningDelta?.(data.content || '');
             break;

src/pages/ChatPage.tsx

@@ -28,6 +28,7 @@ interface StreamingState {
   reasoningText: string;
   answerText: string;
   errorMessage: string | null;
+  retryInfo: any | null;
   retrieved: RetrievedSnippet[];
   toolCalls: ToolCallTrace[];
 }
@@ -66,6 +67,7 @@ export default function ChatPage() {
     reasoningText: '',
     answerText: '',
     errorMessage: null,
+    retryInfo: null,
     retrieved: [],
     toolCalls: []
   });
@@ -209,6 +211,7 @@ export default function ChatPage() {
       reasoningText: '',
       answerText: '',
       errorMessage: null,
+      retryInfo: null,
       retrieved: [],
       toolCalls: []
     });
@@ -228,6 +231,12 @@ export default function ChatPage() {
         content,
         {
           onMeta: (m) => setStreaming((s) => ({ ...s, retrieved: m.retrieved || [] })),
+          onRetry: (data) => {
+            setStreaming((s) => ({ ...s, retryInfo: data }));
+            if (data?.stage === 'fallback_model' && data?.toModel) {
+              setOverrides((o) => ({ ...o, model: String(data.toModel) }));
+            }
+          },
           onReasoningDelta: (chunk) =>
             setStreaming((s) => {
               const next = { ...s, reasoningText: s.reasoningText + chunk };
@@ -274,7 +283,15 @@ export default function ChatPage() {
                 }
               };
               setMessages((m) => [...(m || []).filter((x) => x.id !== tempUser.id), data.user, nextAssistant]);
-              return { active: false, reasoningText: '', answerText: '', errorMessage: null, retrieved: [], toolCalls: [] };
+              return {
+                active: false,
+                reasoningText: '',
+                answerText: '',
+                errorMessage: null,
+                retryInfo: null,
+                retrieved: [],
+                toolCalls: []
+              };
             });
             setSessionRefresh((t) => t + 1);
             setAttachments([]); // 用完即清
@@ -295,7 +312,15 @@ export default function ChatPage() {
               { ...tempUser, id: 'u-' + data.assistant.id }, // 占位
               assistant
             ]);
-            setStreaming({ active: false, reasoningText: '', answerText: '', errorMessage: null, retrieved: [], toolCalls: [] });
+            setStreaming({
+              active: false,
+              reasoningText: '',
+              answerText: '',
+              errorMessage: null,
+              retryInfo: null,
+              retrieved: [],
+              toolCalls: []
+            });
             setSessionRefresh((t) => t + 1);
             // 重新拉一次确保和后端一致（user 真实 id 在那边）
             loadMessages();
@@ -303,7 +328,15 @@ export default function ChatPage() {
           onError: (errMsg) => {
             msg.error('流式失败：' + errMsg);
             setMessages((m) => (m || []).filter((x) => x.id !== tempUser.id));
-            setStreaming({ active: false, reasoningText: '', answerText: '', errorMessage: errMsg, retrieved: [], toolCalls: [] });
+            setStreaming({
+              active: false,
+              reasoningText: '',
+              answerText: '',
+              errorMessage: errMsg,
+              retryInfo: null,
+              retrieved: [],
+              toolCalls: []
+            });
           }
         },
         ctrl.signal,
@@ -321,6 +354,7 @@ export default function ChatPage() {
         reasoningText: '',
         answerText: '',
         errorMessage: e?.message ?? String(e),
+        retryInfo: null,
         retrieved: [],
         toolCalls: []
       });
@@ -393,6 +427,7 @@ export default function ChatPage() {
       reasoningText: '',
       answerText: '',
       errorMessage: null,
+      retryInfo: null,
       retrieved: [],
       toolCalls: []
     });
@@ -405,6 +440,12 @@ export default function ChatPage() {
         assistantId,
         {
           onMeta: (m) => setStreaming((s) => ({ ...s, retrieved: m.retrieved || [] })),
+          onRetry: (data) => {
+            setStreaming((s) => ({ ...s, retryInfo: data }));
+            if (data?.stage === 'fallback_model' && data?.toModel) {
+              setOverrides((o) => ({ ...o, model: String(data.toModel) }));
+            }
+          },
           onReasoningDelta: (chunk) =>
             setStreaming((s) => {
               const next = { ...s, reasoningText: s.reasoningText + chunk };
@@ -434,16 +475,40 @@ export default function ChatPage() {
               return { ...s, toolCalls: list };
             }),
           onDone: () => {
-            setStreaming({ active: false, reasoningText: '', answerText: '', errorMessage: null, retrieved: [], toolCalls: [] });
+            setStreaming({
+              active: false,
+              reasoningText: '',
+              answerText: '',
+              errorMessage: null,
+              retryInfo: null,
+              retrieved: [],
+              toolCalls: []
+            });
             loadMessages();
           },
           onAborted: () => {
-            setStreaming({ active: false, reasoningText: '', answerText: '', errorMessage: null, retrieved: [], toolCalls: [] });
+            setStreaming({
+              active: false,
+              reasoningText: '',
+              answerText: '',
+              errorMessage: null,
+              retryInfo: null,
+              retrieved: [],
+              toolCalls: []
+            });
             loadMessages();
           },
           onError: (errMsg) => {
             msg.error('重新生成失败：' + errMsg);
-            setStreaming({ active: false, reasoningText: '', answerText: '', errorMessage: errMsg, retrieved: [], toolCalls: [] });
+            setStreaming({
+              active: false,
+              reasoningText: '',
+              answerText: '',
+              errorMessage: errMsg,
+              retryInfo: null,
+              retrieved: [],
+              toolCalls: []
+            });
             loadMessages();
           }
         },
@@ -655,6 +720,40 @@ export default function ChatPage() {
                   <div style={{ marginBottom: 24 }}>
                     <div className="bubble assistant">
                       <div style={{ display: 'flex', flexDirection: 'column', gap: 10 }}>
+                        {!!streaming.retryInfo?.message && (
+                          <div
+                            style={{
+                              padding: '8px 10px',
+                              borderRadius: 10,
+                              background: 'rgba(59, 130, 246, 0.08)',
+                              border: '1px solid rgba(59, 130, 246, 0.18)'
+                            }}
+                          >
+                            <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', gap: 10 }}>
+                              <span style={{ fontSize: 12.5, color: 'var(--color-text)', fontWeight: 600 }}>
+                                {streaming.retryInfo.stage === 'fallback_model' ? '自动切换模型' : '自动重试'}
+                              </span>
+                              {streaming.retryInfo.stage === 'fallback_model' ? (
+                                <Tag color="processing" style={{ marginInlineEnd: 0 }}>
+                                  {String(streaming.retryInfo.fromModel || '')} → {String(streaming.retryInfo.toModel || '')}
+                                </Tag>
+                              ) : (
+                                <Tag color="processing" style={{ marginInlineEnd: 0 }}>
+                                  {String(streaming.retryInfo.model || '')}
+                                  {streaming.retryInfo.attempt ? ` · 第${streaming.retryInfo.attempt}次` : ''}
+                                </Tag>
+                              )}
+                            </div>
+                            <div style={{ marginTop: 4, fontSize: 12.5, color: 'var(--color-text-secondary)', lineHeight: 1.55 }}>
+                              {String(streaming.retryInfo.message)}
+                            </div>
+                            {!!streaming.retryInfo.reason && (
+                              <div style={{ marginTop: 4, fontSize: 12, color: 'var(--color-text-tertiary)', lineHeight: 1.5 }}>
+                                {String(streaming.retryInfo.reason)}
+                              </div>
+                            )}
+                          </div>
+                        )}
                         <div>
                           <div style={{ fontSize: 12, color: 'var(--color-text-tertiary)', marginBottom: 4 }}>
                             推理过程