perf: 优化 Agent 流式会话处理

- 合并流式通知与持久化写入，限制浏览器会话缓存

- 增量投影轮次事件并稳定关联异步工具任务

easyflow-ui-admin/app/src/views/ai/agents/components/AgentTryoutPanel.vue

@@ -10,7 +10,7 @@ import type {
   AgentToolBinding,
 } from '../types';
 
-import { computed, onMounted, ref, watch } from 'vue';
+import { computed, onBeforeUnmount, onMounted, ref, watch } from 'vue';
 
 import { ChatTimeline } from '@easyflow/common-ui';
 import { BrushCleaning } from '@easyflow/icons';
@@ -39,6 +39,7 @@ const emit = defineEmits<{ close: [] }>();
 const {
   loading,
   clearDraftSession,
+  dispose,
   markToolApproving,
   markToolRejected,
   copyMessageText,
@@ -80,6 +81,9 @@ async function activateComposer() {
 }
 
 onMounted(() => void activateComposer());
+onBeforeUnmount(() => {
+  dispose();
+});
 
 watch(
   () => [props.agent.id, props.agent.localId],