chore: update Scheduler updater time & update close icon

Author: zhangmo8

src/main/presenter/agentPresenter/streaming/streamUpdateScheduler.ts

@@ -2,7 +2,7 @@ import { eventBus, SendTarget } from '@/eventbus'
 import { STREAM_EVENTS } from '@/events'
 import type { LLMAgentEventData } from '@shared/presenter'
 
-export const STREAM_RENDER_FLUSH_INTERVAL_MS = 200
+export const STREAM_RENDER_FLUSH_INTERVAL_MS = 120
 export const STREAM_DB_FLUSH_INTERVAL_MS = 600
 
 interface PendingDelta {

src/renderer/src/components/ThreadsView.vue

@@ -1,14 +1,14 @@
 <template>
   <div class="w-full h-full overflow-hidden p-2 space-y-3 shrink-0 border-r flex flex-col bg-card">
     <!-- 固定在顶部的"新会话"按钮 -->
-    <div class="flex-none flex flex-row gap-2">
+    <div class="flex-none flex flex-row gap-2 justify-end">
       <Button
         variant="outline"
         size="icon"
         class="shrink-0 text-xs justify-center h-7 w-7"
         @click="chatStore.isSidebarOpen = false"
       >
-        <Icon icon="lucide:chevron-left" class="h-4 w-4" />
+        <Icon icon="lucide:chevron-right" class="h-4 w-4" />
       </Button>
     </div>
 

src/renderer/src/components/artifacts/ArtifactDialog.vue

@@ -17,7 +17,7 @@
       >
         <div class="flex items-center gap-2 grow w-0">
           <button class="p-2 hover:bg-accent/50 rounded-md" @click="artifactStore.dismissArtifact">
-            <Icon icon="lucide:arrow-left" class="w-4 h-4" />
+            <Icon icon="lucide:chevron-right" class="w-4 h-4" />
           </button>
           <h2 class="text-sm font-medium truncate">{{ artifactStore.currentArtifact?.title }}</h2>
         </div>