fix: use custom event for training panel toggle, no more poll inference

SkillInsertDialog dispatches SKILL_TOGGLED_EVENT on user click.
AssistantWorkspace listens for that event to set applied state.
Completely eliminates poll-based state inference that caused flash.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/app/app/assistant.tsx

@@ -41,6 +41,8 @@ import { ClawSessionReplayProvider } from "@/lib/claw-session-replay";
 import { pushSessionUrl } from "@/lib/claw-session-url";
 import { cn } from "@/lib/utils";
 import {
+	SKILL_TOGGLED_EVENT,
+	type SkillToggledDetail,
 	useAppliedTraining,
 	useModelIterationEnabled,
 } from "@/lib/use-training-mode";
@@ -329,31 +331,17 @@ function AssistantWorkspace() {
 		closeActivityPanel();
 	}, [showPipeline, closeActivityPanel]);
 
-	// Skill 开关联动 applied：只有用户在本次页面会话中「主动点击」开启 skill
-	// 才展开面板。页面加载时 skill 已经是 enabled 的情况不自动展开（避免闪烁）。
-	// 判断依据：skill.loading 从 true→false 是初始加载完成，之后 enabled 变化
-	// 才是用户主动操作。
-	const skillLoadedOnce = useRef(false);
-	const prevSkillEnabled = useRef<boolean | null>(null);
+	// 面板只通过用户在 SkillInsertDialog 里显式点击开/关 model-iteration 来控制。
+	// 监听 SkillInsertDialog 发出的自定义事件，不再从 poll 状态变化推断。
 	useEffect(() => {
-		if (skill.loading) return;
-		if (!skillLoadedOnce.current) {
-			skillLoadedOnce.current = true;
-			prevSkillEnabled.current = skill.enabled;
-			// 初始加载：无条件清除 applied（清 localStorage 残留），面板只从用户点击打开
-			if (applied) {
-				setApplied(false);
-			}
-			return;
-		}
-		// 初始加载之后的变化 = 用户主动操作
-		if (skill.enabled && !prevSkillEnabled.current) {
-			setApplied(true);
-		} else if (!skill.enabled && prevSkillEnabled.current) {
-			setApplied(false);
-		}
-		prevSkillEnabled.current = skill.enabled;
-	}, [skill.enabled, skill.loading, applied, setApplied]);
+		const handler = (e: Event) => {
+			const detail = (e as CustomEvent<SkillToggledDetail>).detail;
+			if (detail.skill !== "model-iteration") return;
+			setApplied(detail.enabled);
+		};
+		window.addEventListener(SKILL_TOGGLED_EVENT, handler);
+		return () => window.removeEventListener(SKILL_TOGGLED_EVENT, handler);
+	}, [setApplied]);
 
 	// 注意：用同一棵树 + 条件渲染，保证 <Thread /> 和 <ActivityPanel /> 在
 	// pipeline 切换前后都保持挂载，否则它们会 remount，

frontend/app/components/assistant-ui/thread.tsx

@@ -93,6 +93,7 @@ import {
 } from "@/lib/claw-active-session";
 import { useClawSessionReplay } from "@/lib/claw-session-replay";
 import { cn } from "@/lib/utils";
+import { dispatchSkillToggled } from "@/lib/use-training-mode";
 
 type ComposerInsertEvent = CustomEvent<{ text: string }>;
 
@@ -1800,6 +1801,7 @@ function SkillInsertDialog() {
 				);
 			}
 			setSkills(payload);
+			dispatchSkillToggled({ skill: skill.name, enabled });
 			setStatus(enabled ? `已启用 ${skill.name}` : `已停用 ${skill.name}`);
 		} catch (err) {
 			setSkills(previous);

frontend/app/lib/use-training-mode.ts

@@ -3,6 +3,7 @@
 import { useCallback, useEffect, useState } from "react";
 
 export const SESSION_UPDATED_EVENT = "claw-session-updated";
+export const SKILL_TOGGLED_EVENT = "claw-skill-toggled";
 const APPLIED_STORAGE_PREFIX = "claw.training.applied:";
 
 const MODEL_ITERATION_SKILL_NAMES = new Set(["model-iteration"]);
@@ -158,6 +159,15 @@ export function dispatchSessionUpdated(detail: SessionUpdatedDetail) {
 	);
 }
 
+export type SkillToggledDetail = { skill: string; enabled: boolean };
+
+export function dispatchSkillToggled(detail: SkillToggledDetail) {
+	if (typeof window === "undefined") return;
+	window.dispatchEvent(
+		new CustomEvent<SkillToggledDetail>(SKILL_TOGGLED_EVENT, { detail }),
+	);
+}
+
 export function useTrainingMode(sessionId: string | null) {
 	const [isTraining, setIsTraining] = useState(false);
 	const [loaded, setLoaded] = useState(false);