fix(title): 标题模板 v3 全面审计修复——解决选模板预览不变/新建保存变白等问题

核心问题：
1. TitleTemplateEditor 独立调用 useTitleTemplates()，与 TitleStylePanel 内的 hook 实例形成双实例状态孤岛——保存时只更新 editor 实例的 state 和 localStorage，同 tab 下 storage 事件不触发，导致 TitleStylePanel 的 templates state 陈旧，卡片显示旧样式（新建模板选黄色保存后卡片变白）
2. TITLE_PRESETS 的 BASE 对象缺 position 字段，选预设后 position 被 DEFAULT_TITLE_SETTINGS_FULL.position="top" 覆盖，与预期默认位置 bottom 不一致
3. ColorPicker 的原生 color input 始终 width:0/height:0，即使展开自定义颜色也无法点击

修复内容：
- 移除 TitleTemplateEditor 中的 useTitleTemplates 调用，改为 onSave(data) 回调 props；所有 CRUD 统一由 TitleStylePanel 的 hook 实例完成，彻底解决双实例不同步
- handleRequestCreate 改为只构造草稿（空 id，不写入 localStorage），保存时再 createTemplate，避免打开编辑器即产生脏数据
- TITLE_PRESETS BASE 加 position: "bottom"，预设默认位置一致
- ColorPicker 展开自定义时原生 input 设为 28x28 可点击，选色后自动收起
- 补充 package.json 中缺失的 classnames/dayjs 显式依赖（被代码引用但未声明）

验证：
- tsc --noEmit 零错误
- eslint 零警告
- prettier 格式化

apps/web/package.json

@@ -23,6 +23,8 @@
     "@tanstack/react-query": "^5.45.0",
     "antd": "^5.18.0",
     "axios": "^1.7.2",
+    "classnames": "^2.5.1",
+    "dayjs": "^1.11.23",
     "mp4box": "^2.4.1",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",

apps/web/src/components/title/TitleTemplateEditor.tsx

@@ -16,21 +16,21 @@ import { FONT_OPTIONS } from "./constants"
 import type { TitleSettings } from "../../pages/generate/types"
 import { DEFAULT_TITLE_SETTINGS_FULL } from "../../pages/generate/types"
 import { titleStyleConfigToCamel, camelToTitleStyleConfig } from "./utils"
-import { useTitleTemplates } from "./useTitleTemplates"
 import type { TitleTemplate } from "./template-types"
+import type { TitleStyleConfig } from "./types"
 
 interface Props {
   open: boolean
   template: TitleTemplate
   onClose: () => void
-  onSaved: (template: TitleTemplate) => void
+  /** 用户点击保存：将编辑结果回调给父组件（父组件统一做 CRUD，避免双 hook 实例不同步） */
+  onSave: (data: { name: string; emoji: string; style: Partial<TitleStyleConfig> }) => void
 }
 
 /** 编辑器预览用的背景图（复用卡片池第一张） */
 const EDITOR_BG = "/title-templates/portrait1.jpg"
 
-const TitleTemplateEditor: React.FC<Props> = ({ open, template, onClose, onSaved }) => {
-  const { updateTemplate, createTemplate } = useTitleTemplates()
+const TitleTemplateEditor: React.FC<Props> = ({ open, template, onClose, onSave }) => {
   const [settings, setSettings] = useState<TitleSettings>(() => ({
     ...DEFAULT_TITLE_SETTINGS_FULL,
     ...titleStyleConfigToCamel(template.style || {}),
@@ -63,19 +63,7 @@ const TitleTemplateEditor: React.FC<Props> = ({ open, template, onClose, onSaved
     setSaving(true)
     try {
       const snake = camelToTitleStyleConfig(settings)
-      if (template.isBuiltin) {
-        const t = createTemplate({ name, emoji: formEmoji, style: snake })
-        onSaved(t)
-      } else {
-        updateTemplate(template.id, { name, emoji: formEmoji, style: snake })
-        onSaved({
-          ...template,
-          name,
-          emoji: formEmoji,
-          style: snake,
-          updatedAt: new Date().toISOString(),
-        })
-      }
+      onSave({ name, emoji: formEmoji, style: snake })
     } finally {
       setSaving(false)
     }
@@ -89,7 +77,13 @@ const TitleTemplateEditor: React.FC<Props> = ({ open, template, onClose, onSaved
 
   return (
     <Modal
-      title={template.isBuiltin ? `基于「${template.name}」创建模板` : `编辑模板：${template.name}`}
+      title={
+        !template.id
+          ? "新建模板"
+          : template.isBuiltin
+            ? `基于「${template.name}」创建模板`
+            : `编辑模板：${template.name}`
+      }
       open={open}
       onCancel={onClose}
       width={860}

apps/web/src/components/title/constants.ts

@@ -127,6 +127,7 @@ export interface TitlePreset {
 }
 
 const BASE: Partial<TitleStyleConfig> = {
+  position: "bottom",
   line_overrides: [],
   cover_title_config: null,
 }

apps/web/src/pages/generate/components/title/TitleStylePanel.tsx

@@ -34,9 +34,14 @@ import { buildPresetPreviewSettings } from "@/components/title/utils"
 import TitleMiniPreview from "./TitleMiniPreview"
 import TitleTemplateEditor from "@/components/title/TitleTemplateEditor"
 import { useTitleTemplates } from "@/components/title/useTitleTemplates"
-import { titleStyleConfigToCamel, templateToPreviewSettings } from "@/components/title/utils"
+import {
+  titleStyleConfigToCamel,
+  templateToPreviewSettings,
+  camelToTitleStyleConfig,
+} from "@/components/title/utils"
 import { DEFAULT_TITLE_SETTINGS_FULL } from "../../types"
 import type { TitleTemplate } from "@/components/title/template-types"
+import type { TitleStyleConfig } from "@/components/title/types"
 import "./TitleStylePanel.css"
 import "@/components/title/TitleTemplate.css"
 
@@ -146,13 +151,20 @@ const ColorPicker: React.FC<{
           type="color"
           className="ts-color-native"
           value={value.startsWith("rgba") ? "#000000" : value}
-          onChange={(e) => onChange(e.target.value)}
+          onChange={(e) => {
+            onChange(e.target.value)
+            setCustomOpen(false)
+          }}
           style={{
             opacity: customOpen ? 1 : 0,
             position: customOpen ? "static" : "absolute",
             pointerEvents: customOpen ? "auto" : "none",
-            width: 0,
-            height: 0,
+            width: customOpen ? 28 : 0,
+            height: customOpen ? 28 : 0,
+            border: "none",
+            padding: 0,
+            cursor: "pointer",
+            background: "transparent",
           }}
         />
       </div>
@@ -231,8 +243,14 @@ const TitleStylePanel: React.FC<TitleStylePanelProps> = ({
   const [coverOpen, setCoverOpen] = useState(!!settings.coverTitle)
 
   /* ── 模板相关 hook + 编辑器 state ── */
-  const { templates, createTemplate, duplicateTemplate, deleteTemplate, exportTemplate } =
-    useTitleTemplates()
+  const {
+    templates,
+    createTemplate,
+    duplicateTemplate,
+    updateTemplate,
+    deleteTemplate,
+    exportTemplate,
+  } = useTitleTemplates()
   const [editingTemplate, setEditingTemplate] = useState<TitleTemplate | null>(null)
   const [editorOpen, setEditorOpen] = useState(false)
 
@@ -246,6 +264,7 @@ const TitleStylePanel: React.FC<TitleStylePanelProps> = ({
 
   const handleRequestCreate = useCallback(() => {
     // 新建模板：若已有选中模板，以其样式为起点；否则以当前 settings 为起点
+    // 注意：这里只构造「草稿」对象（不写入 localStorage），保存时再由 handleEditorSave 真正 createTemplate
     let base: TitleSettings = settings
     if (selectedTemplateId) {
       const sel = templates.find((t) => t.id === selectedTemplateId)
@@ -259,40 +278,21 @@ const TitleStylePanel: React.FC<TitleStylePanelProps> = ({
         }
       }
     }
-    const t = createTemplate({
+    const draft: TitleTemplate = {
+      id: "", // 空 id 表示新建草稿
       name: "我的标题模板",
-      style: {
-        font: base.font,
-        size: base.size,
-        color: base.color,
-        bold: base.bold,
-        italic: base.italic,
-        stroke: base.stroke,
-        stroke_width: base.strokeWidth ?? 4,
-        stroke_color: base.strokeColor ?? "#000000",
-        shadow: base.shadow,
-        shadow_offset_x: base.shadowOffsetX ?? 2,
-        shadow_offset_y: base.shadowOffsetY ?? 2,
-        shadow_blur: base.shadowBlur ?? 4,
-        shadow_color: base.shadowColor ?? "rgba(0,0,0,0.8)",
-        bg_enabled: base.bgEnabled,
-        bg_color: base.bgColor,
-        bg_padding: base.bgPadding,
-        bg_radius: base.bgRadius,
-        line_height: base.lineHeight,
-        margin_top: base.marginTop,
-        max_chars_per_line: base.maxCharsPerLine,
-        position: (base.position === "custom" ? "bottom" : base.position) as
-          "top" | "center" | "bottom" | "custom",
-        pos_x: base.posX ?? undefined,
-        pos_y: base.posY ?? undefined,
-        line_overrides: [],
-        cover_title_config: null,
-      },
-    })
-    setEditingTemplate(t)
+      emoji: "✨",
+      isBuiltin: false,
+      style: camelToTitleStyleConfig({
+        ...base,
+        position: base.position === "custom" ? "bottom" : base.position,
+      } as TitleSettings),
+      createdAt: new Date().toISOString(),
+      updatedAt: new Date().toISOString(),
+    }
+    setEditingTemplate(draft)
     setEditorOpen(true)
-  }, [createTemplate, settings, selectedTemplateId, templates])
+  }, [settings, selectedTemplateId, templates])
 
   const handleRequestEdit = useCallback((tpl: TitleTemplate) => {
     setEditingTemplate(tpl)
@@ -342,14 +342,34 @@ const TitleStylePanel: React.FC<TitleStylePanelProps> = ({
     [onApplyTemplate, settings],
   )
 
-  const handleEditorSaved = useCallback(
-    (tpl: TitleTemplate) => {
+  const handleEditorSave = useCallback(
+    (data: { name: string; emoji: string; style: Partial<TitleStyleConfig> }) => {
+      if (!editingTemplate) return
+      let saved: TitleTemplate
+      if (editingTemplate.isBuiltin || !editingTemplate.id) {
+        // 系统模板编辑 → 创建副本；新草稿（空 id）→ 新建
+        saved = createTemplate({ name: data.name, emoji: data.emoji, style: data.style })
+      } else {
+        // 已有自定义模板 → 更新
+        updateTemplate(editingTemplate.id, {
+          name: data.name,
+          emoji: data.emoji,
+          style: data.style,
+        })
+        saved = {
+          ...editingTemplate,
+          name: data.name,
+          emoji: data.emoji,
+          style: data.style,
+          updatedAt: new Date().toISOString(),
+        }
+      }
       setEditorOpen(false)
       setEditingTemplate(null)
-      message.success(`已保存：${tpl.name}`)
-      handleSelectTemplate(tpl)
+      message.success(`已保存：${data.name}`)
+      handleSelectTemplate(saved)
     },
-    [handleSelectTemplate],
+    [editingTemplate, createTemplate, updateTemplate, handleSelectTemplate],
   )
 
   /* ── 渲染模板大卡片（v3：图片背景 + 透明 Canvas 叠字 + 底栏始终可见操作按钮） ── */
@@ -811,7 +831,7 @@ const TitleStylePanel: React.FC<TitleStylePanelProps> = ({
               setEditorOpen(false)
               setEditingTemplate(null)
             }}
-            onSaved={handleEditorSaved}
+            onSave={handleEditorSave}
           />
         )}
       </div>
@@ -854,7 +874,7 @@ const TitleStylePanel: React.FC<TitleStylePanelProps> = ({
             setEditorOpen(false)
             setEditingTemplate(null)
           }}
-          onSaved={handleEditorSaved}
+          onSave={handleEditorSave}
         />
       )}
     </div>