fix(usage): treat empty body_state as missing terminal event

frontend/src/features/usage/components/HorizontalRequestTimeline.vue

@@ -1220,13 +1220,16 @@ const normalizeUpstreamResponseDisplay = (value: unknown): Record<string, unknow
   const body = raw.body
   const bodyRef = readStringField(raw, 'body_ref') ?? readStringField(raw, 'bodyRef')
   const bodyState = readStringField(raw, 'body_state') ?? readStringField(raw, 'bodyState')
+  const meaningfulBodyState = bodyState && bodyState.toLowerCase() !== 'none'
+    ? bodyState
+    : ''
 
   if (
     statusCode == null &&
     !hasRenderableValue(headers) &&
     !hasRenderableValue(body) &&
     !bodyRef &&
-    !bodyState
+    !meaningfulBodyState
   ) {
     return null
   }
@@ -1236,7 +1239,7 @@ const normalizeUpstreamResponseDisplay = (value: unknown): Record<string, unknow
   if (hasRenderableValue(headers)) data.headers = headers
   if (hasRenderableValue(body)) data.body = body
   if (bodyRef) data.body_ref = bodyRef
-  if (bodyState) data.body_state = bodyState
+  if (meaningfulBodyState) data.body_state = meaningfulBodyState
 
   return data
 }

frontend/src/features/usage/components/__tests__/HorizontalRequestTimeline.spec.ts

@@ -481,4 +481,33 @@ describe('HorizontalRequestTimeline', () => {
     expect(root.textContent).not.toContain('不再重试')
     expect(root.textContent).not.toContain('该错误被标记为敏感上游错误')
   })
+
+  it('keeps the failure message when upstream response only records an empty body state', async () => {
+    const trace = buildTrace([
+      buildCandidate({
+        id: 'cand-empty-body-state',
+        provider_id: 'provider-empty-body-state',
+        provider_name: 'Provider Empty Body State',
+        key_id: 'key-empty-body-state',
+        key_name: 'Empty Body State Key',
+        candidate_index: 0,
+        status: 'failed',
+        error_type: 'stream_missing_terminal_event',
+        error_message: 'execution runtime stream ended before provider terminal event',
+        extra_data: {
+          upstream_response: {
+            body_state: 'none',
+          },
+        },
+      }),
+    ])
+
+    const root = mountTimeline(trace)
+    await nextTick()
+
+    expect(root.textContent).toContain('错误信息')
+    expect(root.textContent).toContain('execution runtime stream ended before provider terminal event')
+    expect(root.querySelector('.error-block .error-json')).toBeNull()
+    expect(root.textContent).not.toContain('"body_state":"none"')
+  })
 })