fix(title): toggleAiAutoSelect 简化为纯 toggle，消除状态覆盖风险

apps/web/src/pages/generate/hooks/useStep4Title/useTitleStyleUpdaters.ts

@@ -5,8 +5,6 @@ import type { TitleSettings } from "../../types"
 interface UseTitleStyleUpdatersOptions {
   titleSettings: TitleSettings
   onTitleSettingsChange: (settings: TitleSettings) => void
-  /** AI 自动生成标题函数（由 useStep4Title 从 aiGenerator 注入） */
-  autoGenerateTitle?: () => string
 }
 
 /**
@@ -16,7 +14,6 @@ interface UseTitleStyleUpdatersOptions {
 export function useTitleStyleUpdaters({
   titleSettings,
   onTitleSettingsChange,
-  autoGenerateTitle,
 }: UseTitleStyleUpdatersOptions) {
   /** 匹配预设：只用 color/bold/italic/stroke/shadow，不再匹配 size */
   const getActivePreset = (settings: TitleSettings): string | null => {
@@ -44,17 +41,8 @@ export function useTitleStyleUpdaters({
   )
 
   const toggleAiAutoSelect = useCallback(() => {
-    if (!titleSettings.aiAutoSelect) {
-      // 打开开关：自动生成标题
-      if (autoGenerateTitle) {
-        autoGenerateTitle()
-      }
-    }
-    onTitleSettingsChange({
-      ...titleSettings,
-      aiAutoSelect: !titleSettings.aiAutoSelect,
-    })
-  }, [titleSettings, onTitleSettingsChange, autoGenerateTitle])
+    onTitleSettingsChange({ ...titleSettings, aiAutoSelect: !titleSettings.aiAutoSelect })
+  }, [titleSettings, onTitleSettingsChange])
 
   const updatePosition = useCallback(
     (position: string) => {