fix: align mobile AI streaming fallback

Author: Jinyu Xu

src/api/index.js

@@ -724,7 +724,7 @@ export const klineApi = {
 }
 
 export const aiChatApi = {
-  sendMessage: (payload) => http.post('/api/ai/chat/message', payload, { timeout: 180000 }),
+  sendMessage: (payload) => http.post('/api/ai/chat/message', payload, { timeout: 600000 }),
   streamMessage: async (payload, onEvent) => {
     const language = payload?.language || 'zh-CN'
     const headers = {

src/views/ai-hub/index.vue

@@ -827,7 +827,7 @@ export default {
               selected_task: task?.key || null
             }
           }
-          await this.sendMessageStream(payload, pendingMsg)
+          await this.sendMessageReliable(payload, pendingMsg)
         }
       } catch (err) {
         if (pendingMsg.reportLoading) {
@@ -925,6 +925,35 @@ export default {
         throw new Error(this.text.generateFailed)
       }
     },
+    async sendMessageReliable(payload, pendingMsg) {
+      try {
+        await this.sendMessageStream(payload, pendingMsg)
+        return
+      } catch (_) {
+        this.updatePendingMessage(pendingMsg, {
+          content: this.text.sending,
+          loading: true,
+          actions: []
+        })
+      }
+
+      const response = await aiChatApi.sendMessage({
+        ...payload,
+        session_id: this.sessionId || payload.session_id
+      })
+      const data = response?.data || {}
+      const reply = String(data.reply || data.answer || '').trim()
+      if (!reply) throw new Error(this.text.generateFailed)
+
+      this.sessionId = data.session_id || this.sessionId
+      this.updatePendingMessage(pendingMsg, {
+        id: data.message_id || pendingMsg.id,
+        content: '',
+        loading: false,
+        actions: this.filterMobileActions(data.actions || [])
+      })
+      await this.revealStreamText(pendingMsg, reply)
+    },
     isUnsupportedMobileAction(action) {
       const payload = action?.payload || {}
       const signature = [

tests/unit/mobile-usage-boundary.test.mjs

@@ -195,11 +195,16 @@ test('market, chart, and accounts provide a complete mobile path', () => {
 
 test('AI composer stays at the bottom and uses a text send action', () => {
   const aiHub = read('src/views/ai-hub/index.vue')
+  const api = read('src/api/index.js')
 
   assert.match(aiHub, /\{\{ text\.send \}\}/)
   assert.match(aiHub, /\.bottom-suggestions\s*\{\s*margin-top: auto;/)
   assert.doesNotMatch(aiHub, /copilot-body\.empty \.bottom-suggestions/)
   assert.match(aiHub, /\.send-action[\s\S]*min-width: 72px/)
+  assert.match(aiHub, /sendMessageReliable\(payload, pendingMsg\)/)
+  assert.match(aiHub, /await this\.sendMessageStream\(payload, pendingMsg\)[\s\S]*aiChatApi\.sendMessage\(\{/)
+  assert.match(api, /sendMessage: \(payload\) => http\.post\('\/api\/ai\/chat\/message', payload, \{ timeout: 600000 \}\)/)
+  assert.match(api, /streamMessage:[\s\S]*\/api\/ai\/chat\/message\/stream/)
 })
 
 test('signal chart supports mobile history navigation and candle inspection', () => {