fix(web): code review pass — scroll watch, SSE same-origin, store concurrency, modal reset, admin validation

web/src/stores/chat.ts

@@ -8,7 +8,7 @@ import {
   type ListConversationsParams,
 } from '@/api/chat'
 import {
-  useChatStream,
+  startChatStream,
   type ChatStreamEvent,
   type ChatStreamHandle,
 } from '@/composables/useChatStream'
@@ -61,6 +61,7 @@ export const useChatStore = defineStore('chat', () => {
 
   async function sendMessage(content: string, attachmentIds: string[] = []) {
     if (!currentConversation.value) return
+    if (streamingMessageId.value !== null) return
     const conv = currentConversation.value
     const resp = await chatApi.sendMessage(conv.id, {
       content,
@@ -119,16 +120,20 @@ export const useChatStore = defineStore('chat', () => {
     await chatApi.deleteConversation(id)
     conversations.value = conversations.value.filter((c) => c.id !== id)
     if (currentConversation.value?.id === id) {
-      currentConversation.value = null
-      messages.value = []
-      detachStream()
+      closeCurrent()
     }
   }
 
+  function closeCurrent() {
+    detachStream()
+    currentConversation.value = null
+    messages.value = []
+    streamingMessageId.value = null
+  }
+
   function attachStream(streamUrl: string, sinceMessageID: number) {
     detachStream()
-    const stream = useChatStream()
-    streamHandle.value = stream.start(streamUrl, sinceMessageID, {
+    streamHandle.value = startChatStream(streamUrl, sinceMessageID, {
       onEvent: (ev) => applyStreamEvent(ev),
       onClose: () => {
         streamHandle.value = null
@@ -183,6 +188,8 @@ export const useChatStore = defineStore('chat', () => {
         break
       }
       case 'done':
+        // 后端事件顺序：EventUsage → EventDone（参见 internal/chat/streamer.go）。
+        // tokens 已在 'usage' 分支写入；某些 provider 不发 usage 时此处不会兜底。
         msg.status = 'ok'
         streamingMessageId.value = null
         break
@@ -204,6 +211,7 @@ export const useChatStore = defineStore('chat', () => {
     isStreaming,
     loadConversations,
     openConversation,
+    closeCurrent,
     sendMessage,
     cancelMessage,
     retryMessage,