fix(title): 预设样式不再绑定字号，applyPreset/getActivePreset去掉size匹配

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

@@ -15,10 +15,10 @@ export function useTitleStyleUpdaters({
   titleSettings,
   onTitleSettingsChange,
 }: UseTitleStyleUpdatersOptions) {
+  /** 匹配预设：只用 color/bold/italic/stroke/shadow，不再匹配 size */
   const getActivePreset = (settings: TitleSettings): string | null => {
     for (const p of TITLE_PRESETS) {
       if (
-        settings.size === p.style.size &&
         settings.color === p.style.color &&
         settings.bold === p.style.bold &&
         settings.italic === p.style.italic &&
@@ -88,13 +88,13 @@ export function useTitleStyleUpdaters({
     onTitleSettingsChange({ ...titleSettings, shadow: !titleSettings.shadow })
   }, [titleSettings, onTitleSettingsChange])
 
+  /** 应用预设：只覆盖 color/bold/italic/stroke/shadow，不改变字号 */
   const applyPreset = useCallback(
     (presetKey: string) => {
       const preset = TITLE_PRESETS.find((p) => p.key === presetKey)
       if (!preset) return
       onTitleSettingsChange({
         ...titleSettings,
-        size: preset.style.size,
         color: preset.style.color,
         bold: preset.style.bold,
         italic: preset.style.italic,