diff --git a/web/src/App.tsx b/web/src/App.tsx
index bc69aec5..469836a4 100644
--- a/web/src/App.tsx
+++ b/web/src/App.tsx
@@ -1160,14 +1160,11 @@ export default function App() {
     () =>
       resolveChatComposerStreaming(currentSessionMessages, {
         turnLive: turnRuntime.isThinking,
-        taskRunLive: taskRunStream.isThinking || Boolean(taskRunStream.activeTaskRunId),
+        // Retained activeTaskRunId alone must not lock send after the run is
+        // terminal; orphan streaming_status + leftover run id was blocking UI-05+.
+        taskRunLive: taskRunStream.isThinking,
       }),
-    [
-      currentSessionMessages,
-      turnRuntime.isThinking,
-      taskRunStream.isThinking,
-      taskRunStream.activeTaskRunId,
-    ],
+    [currentSessionMessages, turnRuntime.isThinking, taskRunStream.isThinking],
   );
 
   // 处理交互卡片动作流转 (驳回门禁确认、撤回、取消与终审联动)
diff --git a/web/src/hooks/useTaskRunStream.ts b/web/src/hooks/useTaskRunStream.ts
index ba678491..0fba8bff 100644
--- a/web/src/hooks/useTaskRunStream.ts
+++ b/web/src/hooks/useTaskRunStream.ts
@@ -84,6 +84,7 @@ export function useTaskRunStream(activeSessionId: string) {
       rt.controller?.abort();
       rt.controller = null;
       rt.thinking = false;
+      rt.runId = null;
       notify();
     },
     [getRuntime, notify],