diff --git a/backend-fastapi/ai_platform/nodes/builtin/intent_node.py b/backend-fastapi/ai_platform/nodes/builtin/intent_node.py
index ca7a86c..e5cea8f 100644
--- a/backend-fastapi/ai_platform/nodes/builtin/intent_node.py
+++ b/backend-fastapi/ai_platform/nodes/builtin/intent_node.py
@@ -435,5 +435,5 @@ class IntentNode(BaseNode):
                     'default': 'intent_result',
                 },
             },
-            'required': ['model_id', 'intents'],
+            'required': ['intents'],
         }
diff --git a/backend-fastapi/ai_platform/nodes/builtin/llm_node.py b/backend-fastapi/ai_platform/nodes/builtin/llm_node.py
index 95e8d2c..bb04d15 100644
--- a/backend-fastapi/ai_platform/nodes/builtin/llm_node.py
+++ b/backend-fastapi/ai_platform/nodes/builtin/llm_node.py
@@ -1065,5 +1065,5 @@ class LLMNode(BaseNode):
                     'default': 'llm_response',
                 },
             },
-            'required': ['model_id'],
+            'required': [],
         }
diff --git a/backend-fastapi/ai_platform/services/agent_service.py b/backend-fastapi/ai_platform/services/agent_service.py
index 13e2485..512ea06 100644
--- a/backend-fastapi/ai_platform/services/agent_service.py
+++ b/backend-fastapi/ai_platform/services/agent_service.py
@@ -241,8 +241,6 @@ class AgentService:
         if not model:
             return None
 
-        agent.model_id = model.id
-        await self._db.flush()
         logger.info(
             "Agent %s has no active model, fallback to default chat model %s",
             getattr(agent, "code", agent.id),
diff --git a/web/apps/web-ele/src/components/dashboard-design/DashboardRenderer.vue b/web/apps/web-ele/src/components/dashboard-design/DashboardRenderer.vue
index debc5b0..fd107bb 100644
--- a/web/apps/web-ele/src/components/dashboard-design/DashboardRenderer.vue
+++ b/web/apps/web-ele/src/components/dashboard-design/DashboardRenderer.vue
@@ -66,7 +66,7 @@ const getWidget = (i: string) => {
 const getAnimationDelay = (i: string) => {
   if (!dashboardConfig.value) return 0;
   const index = dashboardConfig.value.widgets.findIndex((w) => w.i === i);
-  return index * 80; // 每个组件延迟 80ms
+  return index * 20;
 };
 </script>
 
diff --git a/web/apps/web-ele/src/components/dashboard-design/components/WidgetRenderer.vue b/web/apps/web-ele/src/components/dashboard-design/components/WidgetRenderer.vue
index 9beb5f1..95877ff 100644
--- a/web/apps/web-ele/src/components/dashboard-design/components/WidgetRenderer.vue
+++ b/web/apps/web-ele/src/components/dashboard-design/components/WidgetRenderer.vue
@@ -249,7 +249,7 @@ const animationClass = computed(() => {
     <!-- 加载状态 -->
     <div
       v-if="isLoading"
-      class="absolute inset-0 z-10 flex items-center justify-center bg-white/50"
+      class="widget-loading-mask absolute inset-0 z-10 flex items-center justify-center"
     >
       <Loader2 class="text-primary h-6 w-6 animate-spin" />
     </div>
@@ -296,7 +296,9 @@ const animationClass = computed(() => {
 .widget-enter {
   opacity: 0;
   transform: translateY(20px) scale(0.95);
-  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
+  transition:
+    opacity 0.22s cubic-bezier(0.22, 1, 0.36, 1),
+    transform 0.22s cubic-bezier(0.22, 1, 0.36, 1);
 }
 
 .widget-entered {
@@ -310,4 +312,8 @@ const animationClass = computed(() => {
 }
 
 /* 入场动画 */
+
+.widget-loading-mask {
+  background: color-mix(in srgb, var(--el-bg-color) 78%, transparent);
+}
 </style>
diff --git a/web/apps/web-ele/src/preferences.ts b/web/apps/web-ele/src/preferences.ts
index 0a11464..6280f48 100644
--- a/web/apps/web-ele/src/preferences.ts
+++ b/web/apps/web-ele/src/preferences.ts
@@ -17,7 +17,7 @@ export const overridesPreferences = defineOverridesPreferences({
     accessMode: 'mixed',
     authPageLayout: 'panel-center',
     defaultHomePath: '/page-render/main_home',
-    layout: 'sidebar-nav',
+    layout: 'header-sidebar-nav',
     preferencesButtonPosition: 'header',
   },
   sidebar: {
diff --git a/web/apps/web-ele/src/views/ai-platform/agent/editor/index.vue b/web/apps/web-ele/src/views/ai-platform/agent/editor/index.vue
index 6193309..342d80d 100644
--- a/web/apps/web-ele/src/views/ai-platform/agent/editor/index.vue
+++ b/web/apps/web-ele/src/views/ai-platform/agent/editor/index.vue
@@ -784,6 +784,7 @@ onMounted(() => {
                       </template>
                       <ElSelect
                         v-model="formData.model_id"
+                        clearable
                         filterable
                         :placeholder="$t('ai-platform.agent.model.placeholder')"
                         style="width: 100%"
@@ -795,6 +796,9 @@ onMounted(() => {
                           :value="model.id"
                         />
                       </ElSelect>
+                      <div class="text-muted-foreground mt-1 text-xs">
+                        留空时发布和运行会自动使用当前启用的默认 chat 模型。
+                      </div>
                     </ElFormItem>
 
                     <ElFormItem>
diff --git a/web/apps/web-ele/src/views/ai-platform/workflow/editor/panels/IntentPanel.vue b/web/apps/web-ele/src/views/ai-platform/workflow/editor/panels/IntentPanel.vue
index 44489a3..078b26a 100644
--- a/web/apps/web-ele/src/views/ai-platform/workflow/editor/panels/IntentPanel.vue
+++ b/web/apps/web-ele/src/views/ai-platform/workflow/editor/panels/IntentPanel.vue
@@ -124,7 +124,8 @@ const removeExample = (intentIndex: number, exampleIndex: number) => {
     <ElFormItem :label="$t('ai-platform.workflow.panels.common.model')">
       <ElSelect
         v-model="form.model_id"
-        placeholder="{{ $t('ai-platform.workflow.panels.intent.selectModelHint') }}"
+        clearable
+        :placeholder="$t('ai-platform.workflow.panels.intent.selectModelHint')"
       >
         <ElOption
           v-for="m in models"
@@ -135,6 +136,7 @@ const removeExample = (intentIndex: number, exampleIndex: number) => {
       </ElSelect>
       <div class="text-muted-foreground mt-1 text-xs">
         {{ $t('ai-platform.workflow.panels.intent.modelHint') }}
+        留空时运行会自动使用当前启用的默认 chat 模型。
       </div>
     </ElFormItem>
 
diff --git a/web/apps/web-ele/src/views/ai-platform/workflow/editor/panels/LLMPanel.vue b/web/apps/web-ele/src/views/ai-platform/workflow/editor/panels/LLMPanel.vue
index 40dbc4e..1aa9e4d 100644
--- a/web/apps/web-ele/src/views/ai-platform/workflow/editor/panels/LLMPanel.vue
+++ b/web/apps/web-ele/src/views/ai-platform/workflow/editor/panels/LLMPanel.vue
@@ -174,6 +174,7 @@ watch(
     <ElFormItem :label="$t('ai-platform.workflow.panels.common.model')">
       <ElSelect
         v-model="form.model_id"
+        clearable
         :placeholder="$t('ai-platform.workflow.panels.common.selectModel')"
       >
         <ElOption
@@ -183,6 +184,9 @@ watch(
           :value="m.id"
         />
       </ElSelect>
+      <div class="text-muted-foreground mt-1 text-xs">
+        留空时运行会自动使用当前启用的默认 chat 模型。
+      </div>
     </ElFormItem>
 
     <ElFormItem>