fix(dashboard): webchat input textarea is disabled when session controller is active

Removed the disable attribute of Input in isConvRunning. Added an activeSSE counter to correctly determine the current session state and prevent new input from causing interface display errors during session_waiter execution. Set isStreaming after streaming input ends to restore the text box.

#3037 #2892

dashboard/src/components/chat/Chat.vue

@@ -149,7 +149,7 @@
                         <div
                             style="width: 85%; max-width: 900px; margin: 0 auto; border: 1px solid #e0e0e0; border-radius: 24px;">
                             <textarea id="input-field" v-model="prompt" @keydown="handleInputKeyDown"
-                                :disabled="isStreaming || isConvRunning" @click:clear="clearMessage"
+                                :disabled="isStreaming" @click:clear="clearMessage"
                                 placeholder="Ask AstrBot..."
                                 style="width: 100%; resize: none; outline: none; border: 1px solid var(--v-theme-border); border-radius: 12px; padding: 8px 16px; min-height: 40px; font-family: inherit; font-size: 16px; background-color: var(--v-theme-surface);"></textarea>
                             <div
@@ -312,6 +312,7 @@ export default {
             isConvRunning: false, // Track if the current conversation is running
 
             isToastedRunningInfo: false, // To avoid multiple toasts
+            activeSSECount: 0, // Track number of active SSE connections
         }
     },
 
@@ -850,6 +851,10 @@ export default {
             const selectedModelName = selection?.modelName || '';
 
             try {
+                this.activeSSECount++;
+                if (this.activeSSECount === 1) {
+                    this.isConvRunning = true;
+                }
                 const response = await fetch('/api/chat/send', {
                     method: 'POST',
                     headers: {
@@ -960,6 +965,10 @@ export default {
                             if ((chunk_json.type === 'break' && chunk_json.streaming) || !chunk_json.streaming) {
                                 // break means a segment end
                                 in_streaming = false;
+                                // 当SSE传入streaming=false时，恢复输入框
+                                if (!chunk_json.streaming) {
+                                    this.isStreaming = false;
+                                }
                             }
                         }
                     } catch (readError) {
@@ -979,6 +988,10 @@ export default {
                 this.loadingChat = false;
             } finally {
                 this.isStreaming = false;
+                this.activeSSECount--;
+                if (this.activeSSECount === 0) {
+                    this.isConvRunning = false;
+                }
             }
         },