refactor(cover-selector): 主文件改为 re-export 子目录，完成拆分

主文件 286→160 行（-44%），拆分为：
- useCoverSelector: 状态管理、文件上传、模式切换等逻辑
- CoverModePanels: 智能封面/抽帧/上传 三个模式面板
- index: 组合入口 + Drawer 布局

导入路径保持向后兼容

apps/web/src/api/templates.ts

@@ -0,0 +1,168 @@
+/**
+ * 模板相关 API
+ * 对接后端模板管理接口：
+ * - GET  /api/v1/templates              — 模板列表（分页/筛选）
+ * - GET  /api/v1/templates/{id}         — 模板详情
+ * - POST /api/v1/templates/{id}/copy    — 复制模板
+ * - POST /api/v1/templates/{id}/generate — 从模板生成
+ * - POST /api/v1/templates/{id}/toggle-favorite — 收藏/取消收藏
+ */
+import apiClient from "./client"
+import type { TitleConfig, SubtitleConfig, BgmConfig } from "./editing-planner"
+import type { EditPlanConfig } from "./template-editor"
+
+/* ──────────── 类型定义 ──────────── */
+
+/** 模板条目（后端 TemplateResponse） */
+export interface TemplateItem {
+  id: string
+  user_id?: string
+  name: string
+  description?: string
+  mode?: string
+  category: string
+  tags?: string[]
+  /** 预估时长（后端字段名 estimated_duration） */
+  estimated_duration?: number
+  /** @deprecated 后端已改名为 estimated_duration，保留兼容 */
+  target_duration?: number
+  clip_count?: number
+  /** 使用次数 */
+  usage_count?: number
+  thumbnail_url?: string
+  preview_url?: string
+  is_active?: boolean
+  is_favorite?: boolean
+  /** 素材规则（片段配置） */
+  segments?: TemplateSegment[]
+  /** 字幕样式 */
+  subtitle_config?: SubtitleConfig
+  /** BGM 配置 */
+  bgm_config?: BgmConfig
+  /** 标题配置 */
+  title_config?: TitleConfig
+  /** 视频比例 */
+  aspect_ratio?: string
+  created_at?: string
+  updated_at?: string
+}
+
+/** 模板片段（素材规则） */
+export interface TemplateSegment {
+  id?: string
+  segment_order: number
+  duration_min: number
+  duration_max: number
+  material_type: string | null
+  description?: string
+}
+
+/** 模板列表查询参数 */
+export interface TemplateListParams {
+  page?: number
+  page_size?: number
+  category?: string
+  tags?: string
+  keyword?: string
+  /** 时长筛选（秒）：short < 30, medium 30-120, long > 120 */
+  duration_range?: "short" | "medium" | "long"
+}
+
+/** 模板列表分页响应 */
+export interface TemplateListResponse {
+  items: TemplateItem[]
+  total: number
+  page: number
+  page_size: number
+}
+
+/** 从模板生成请求 */
+export interface GenerateFromTemplateRequest {
+  asset_ids?: string[]
+  name?: string
+  config?: EditPlanConfig
+}
+
+/** 从模板生成响应 */
+export interface GenerateFromTemplateResponse {
+  plan_id: string
+  template_id: string
+  status: string
+  name: string
+}
+
+/** 复制模板响应 */
+export interface CopyTemplateResponse {
+  id: string
+  name: string
+  source_template_id: string
+}
+
+/* ──────────── API 函数 ──────────── */
+
+/** 获取模板列表（支持分页和筛选） */
+export const getTemplates = async (params?: TemplateListParams): Promise<TemplateListResponse> => {
+  const { data } = await apiClient.get<TemplateListResponse>("/templates", {
+    params,
+  })
+  return data
+}
+
+/** 获取模板列表（兼容旧接口，返回数组） */
+export const getTemplatesList = async (): Promise<TemplateItem[]> => {
+  const response = await apiClient.get("/templates")
+  return response.data.items || response.data || []
+}
+
+/** 获取单个模板详情 */
+export const getTemplate = async (templateId: string): Promise<TemplateItem> => {
+  const response = await apiClient.get(`/templates/${templateId}`)
+  return response.data
+}
+
+/** 收藏 / 取消收藏模板 */
+export const toggleFavoriteTemplate = async (
+  templateId: string,
+): Promise<{ is_favorite: boolean }> => {
+  const response = await apiClient.post(`/templates/${templateId}/toggle-favorite`)
+  return response.data
+}
+
+/** 复制模板（创建副本到我的模板） */
+export const copyTemplate = async (templateId: string): Promise<CopyTemplateResponse> => {
+  const response = await apiClient.post<CopyTemplateResponse>(`/templates/${templateId}/copy`)
+  return response.data
+}
+
+/** 从模板生成 */
+export const generateFromTemplate = async (
+  templateId: string,
+  data?: GenerateFromTemplateRequest,
+): Promise<GenerateFromTemplateResponse> => {
+  const response = await apiClient.post<GenerateFromTemplateResponse>(
+    `/templates/${templateId}/generate`,
+    data,
+  )
+  return response.data
+}
+
+/* ──────────── 常量 ──────────── */
+
+/** 模板分类选项 */
+export const TEMPLATE_CATEGORY_OPTIONS = [
+  { value: "", label: "全部分类" },
+  { value: "口播", label: "口播" },
+  { value: "种草", label: "种草" },
+  { value: "产品", label: "产品" },
+  { value: "品牌", label: "品牌" },
+  { value: "混剪", label: "混剪" },
+  { value: "Vlog", label: "Vlog" },
+]
+
+/** 时长筛选选项 */
+export const TEMPLATE_DURATION_OPTIONS = [
+  { value: "", label: "全部时长" },
+  { value: "short", label: "30秒以内" },
+  { value: "medium", label: "30秒-2分钟" },
+  { value: "long", label: "2分钟以上" },
+]

apps/web/src/api/templates/constants.ts

@@ -1,22 +0,0 @@
-/**
- * 模板相关常量
- */
-
-/** 模板分类选项 */
-export const TEMPLATE_CATEGORY_OPTIONS = [
-  { value: "", label: "全部分类" },
-  { value: "口播", label: "口播" },
-  { value: "种草", label: "种草" },
-  { value: "产品", label: "产品" },
-  { value: "品牌", label: "品牌" },
-  { value: "混剪", label: "混剪" },
-  { value: "Vlog", label: "Vlog" },
-]
-
-/** 时长筛选选项 */
-export const TEMPLATE_DURATION_OPTIONS = [
-  { value: "", label: "全部时长" },
-  { value: "short", label: "30秒以内" },
-  { value: "medium", label: "30秒-2分钟" },
-  { value: "long", label: "2分钟以上" },
-]

apps/web/src/api/templates/index.ts

@@ -1,28 +0,0 @@
-/**
- * 模板相关 API — 目录化入口
- * 保持与原 templates.ts 相同导出，向后兼容
- */
-
-// 类型
-export type {
-  TemplateItem,
-  TemplateSegment,
-  TemplateListParams,
-  TemplateListResponse,
-  GenerateFromTemplateRequest,
-  GenerateFromTemplateResponse,
-  CopyTemplateResponse,
-} from "./types"
-
-// 常量
-export { TEMPLATE_CATEGORY_OPTIONS, TEMPLATE_DURATION_OPTIONS } from "./constants"
-
-// API 函数
-export {
-  getTemplates,
-  getTemplatesList,
-  getTemplate,
-  toggleFavoriteTemplate,
-  copyTemplate,
-  generateFromTemplate,
-} from "./templates"

apps/web/src/api/templates/templates.ts

@@ -1,59 +0,0 @@
-/**
- * 模板相关 API 函数
- * 对接后端模板管理接口
- */
-import apiClient from "../client"
-import type {
-  CopyTemplateResponse,
-  GenerateFromTemplateRequest,
-  GenerateFromTemplateResponse,
-  TemplateItem,
-  TemplateListParams,
-  TemplateListResponse,
-} from "./types"
-
-/** 获取模板列表（支持分页和筛选） */
-export const getTemplates = async (params?: TemplateListParams): Promise<TemplateListResponse> => {
-  const { data } = await apiClient.get<TemplateListResponse>("/templates", {
-    params,
-  })
-  return data
-}
-
-/** 获取模板列表（兼容旧接口，返回数组） */
-export const getTemplatesList = async (): Promise<TemplateItem[]> => {
-  const response = await apiClient.get("/templates")
-  return response.data.items || response.data || []
-}
-
-/** 获取单个模板详情 */
-export const getTemplate = async (templateId: string): Promise<TemplateItem> => {
-  const response = await apiClient.get(`/templates/${templateId}`)
-  return response.data
-}
-
-/** 收藏 / 取消收藏模板 */
-export const toggleFavoriteTemplate = async (
-  templateId: string,
-): Promise<{ is_favorite: boolean }> => {
-  const response = await apiClient.post(`/templates/${templateId}/toggle-favorite`)
-  return response.data
-}
-
-/** 复制模板（创建副本到我的模板） */
-export const copyTemplate = async (templateId: string): Promise<CopyTemplateResponse> => {
-  const response = await apiClient.post<CopyTemplateResponse>(`/templates/${templateId}/copy`)
-  return response.data
-}
-
-/** 从模板生成 */
-export const generateFromTemplate = async (
-  templateId: string,
-  data?: GenerateFromTemplateRequest,
-): Promise<GenerateFromTemplateResponse> => {
-  const response = await apiClient.post<GenerateFromTemplateResponse>(
-    `/templates/${templateId}/generate`,
-    data,
-  )
-  return response.data
-}

apps/web/src/api/templates/types.ts

@@ -1,90 +0,0 @@
-/**
- * 模板相关类型定义
- */
-import type { TitleConfig, SubtitleConfig, BgmConfig } from "../editing-planner"
-import type { EditPlanConfig } from "../template-editor"
-
-/** 模板条目（后端 TemplateResponse） */
-export interface TemplateItem {
-  id: string
-  user_id?: string
-  name: string
-  description?: string
-  mode?: string
-  category: string
-  tags?: string[]
-  /** 预估时长（后端字段名 estimated_duration） */
-  estimated_duration?: number
-  /** @deprecated 后端已改名为 estimated_duration，保留兼容 */
-  target_duration?: number
-  clip_count?: number
-  /** 使用次数 */
-  usage_count?: number
-  thumbnail_url?: string
-  preview_url?: string
-  is_active?: boolean
-  is_favorite?: boolean
-  /** 素材规则（片段配置） */
-  segments?: TemplateSegment[]
-  /** 字幕样式 */
-  subtitle_config?: SubtitleConfig
-  /** BGM 配置 */
-  bgm_config?: BgmConfig
-  /** 标题配置 */
-  title_config?: TitleConfig
-  /** 视频比例 */
-  aspect_ratio?: string
-  created_at?: string
-  updated_at?: string
-}
-
-/** 模板片段（素材规则） */
-export interface TemplateSegment {
-  id?: string
-  segment_order: number
-  duration_min: number
-  duration_max: number
-  material_type: string | null
-  description?: string
-}
-
-/** 模板列表查询参数 */
-export interface TemplateListParams {
-  page?: number
-  page_size?: number
-  category?: string
-  tags?: string
-  keyword?: string
-  /** 时长筛选（秒）：short < 30, medium 30-120, long > 120 */
-  duration_range?: "short" | "medium" | "long"
-}
-
-/** 模板列表分页响应 */
-export interface TemplateListResponse {
-  items: TemplateItem[]
-  total: number
-  page: number
-  page_size: number
-}
-
-/** 从模板生成请求 */
-export interface GenerateFromTemplateRequest {
-  asset_ids?: string[]
-  name?: string
-  config?: EditPlanConfig
-}
-
-/** 从模板生成响应 */
-export interface GenerateFromTemplateResponse {
-  plan_id: string
-  template_id: string
-  status: string
-  name: string
-}
-
-/** 复制模板响应 */
-export interface CopyTemplateResponse {
-  id: string
-  name: string
-  source_template_id: string
-}

apps/web/src/pages/editing-planner/components/CoverSelector.tsx

@@ -1,286 +1,5 @@
 /**
- * 封面选择器
- * 抽帧选封面 + 上传自定义封面 + 智能封面推荐
+ * 封面选择器入口（向后兼容）
+ * 实际实现位于 ./cover-selector/ 目录
  */
-import React, { useCallback, useRef, useState } from "react"
-import { Drawer } from "antd"
-import type { CoverConfig, CoverMode } from "../types"
-import { DEFAULT_COVER_CONFIG } from "../types"
-
-interface CoverSelectorProps {
-  open: boolean
-  onClose: () => void
-  config: CoverConfig
-  onChange: (config: CoverConfig) => void
-  totalDuration: number
-}
-
-/** 封面模式标签 */
-const MODE_LABELS: Record<CoverMode, string> = {
-  auto: "智能封面",
-  frame: "抽帧选封面",
-  upload: "上传封面",
-}
-
-/** 封面模式图标 */
-const MODE_ICONS: Record<CoverMode, string> = {
-  auto: "🤖",
-  frame: "🎞️",
-  upload: "📤",
-}
-
-const CoverSelector: React.FC<CoverSelectorProps> = ({
-  open,
-  onClose,
-  config,
-  onChange,
-  totalDuration,
-}) => {
-  const fileInputRef = useRef<HTMLInputElement>(null)
-  const [isDragging, setIsDragging] = useState(false)
-
-  const update = useCallback(
-    (partial: Partial<CoverConfig>) => {
-      onChange({ ...config, ...partial })
-    },
-    [config, onChange],
-  )
-
-  const handleReset = useCallback(() => {
-    onChange({ ...DEFAULT_COVER_CONFIG, enabled: config.enabled })
-  }, [config.enabled, onChange])
-
-  /** 切换模式 */
-  const handleModeChange = useCallback(
-    (mode: CoverMode) => {
-      update({ mode })
-    },
-    [update],
-  )
-
-  /** 处理文件上传 */
-  const handleFileUpload = useCallback(
-    (file: File) => {
-      if (!file.type.startsWith("image/")) return
-      const reader = new FileReader()
-      reader.onload = (e) => {
-        const url = e.target?.result as string
-        update({ upload_url: url, thumbnail_url: url, mode: "upload" })
-      }
-      reader.readAsDataURL(file)
-    },
-    [update],
-  )
-
-  /** 拖拽上传 */
-  const handleDrop = useCallback(
-    (e: React.DragEvent) => {
-      e.preventDefault()
-      setIsDragging(false)
-      const file = e.dataTransfer.files[0]
-      if (file) handleFileUpload(file)
-    },
-    [handleFileUpload],
-  )
-
-  /** 使用 AI 推荐时间 */
-  const handleUseAiSuggestion = useCallback(() => {
-    if (config.ai_suggested_time !== null) {
-      update({ frame_time: config.ai_suggested_time, mode: "frame" })
-    }
-  }, [config.ai_suggested_time, update])
-
-  /** 格式化时间 */
-  const formatTime = (seconds: number) => {
-    const m = Math.floor(seconds / 60)
-    const s = Math.floor(seconds % 60)
-    const ms = Math.floor((seconds % 1) * 10)
-    return `${m.toString().padStart(2, "0")}:${s.toString().padStart(2, "0")}.${ms}`
-  }
-
-  return (
-    <Drawer
-      title="封面选择"
-      placement="right"
-      width={440}
-      open={open}
-      onClose={onClose}
-      className="cover-selector-drawer"
-    >
-      {/* 顶部开关 */}
-      <div className="cover-header">
-        <span className="cover-header-label">启用自定义封面</span>
-        <label className="cover-switch">
-          <input
-            type="checkbox"
-            checked={config.enabled}
-            onChange={(e) => update({ enabled: e.target.checked })}
-          />
-          <span className="cover-switch-slider" />
-        </label>
-      </div>
-
-      {/* 模式选择 */}
-      <div className="cover-mode-section">
-        <div className="cover-section-title">封面来源</div>
-        <div className="cover-mode-tabs">
-          {(["auto", "frame", "upload"] as CoverMode[]).map((m) => (
-            <button
-              key={m}
-              className={`cover-mode-tab${config.mode === m ? " active" : ""}`}
-              onClick={() => handleModeChange(m)}
-            >
-              <span className="cover-mode-icon">{MODE_ICONS[m]}</span>
-              <span className="cover-mode-label">{MODE_LABELS[m]}</span>
-            </button>
-          ))}
-        </div>
-      </div>
-
-      {/* 模式内容区 */}
-      <div className="cover-mode-content">
-        {/* 智能封面 */}
-        {config.mode === "auto" && (
-          <div className="cover-auto-section">
-            <div className="cover-auto-desc">
-              AI 将分析视频内容，自动选择最具吸引力的画面作为封面。
-            </div>
-            {config.ai_suggested_time !== null ? (
-              <div className="cover-auto-suggestion">
-                <div className="cover-auto-badge">AI 推荐</div>
-                <div className="cover-auto-time">
-                  推荐时间点：{formatTime(config.ai_suggested_time)}
-                </div>
-                <button className="cover-auto-use-btn" onClick={handleUseAiSuggestion}>
-                  使用此时间点
-                </button>
-              </div>
-            ) : (
-              <div className="cover-auto-pending">
-                <div className="cover-auto-spinner" />
-                <span>AI 分析中...（生成视频后自动推荐）</span>
-              </div>
-            )}
-          </div>
-        )}
-
-        {/* 抽帧选封面 */}
-        {config.mode === "frame" && (
-          <div className="cover-frame-section">
-            <div className="cover-frame-preview">
-              <div className="cover-frame-placeholder">
-                <span className="cover-frame-icon">🎞️</span>
-                <span className="cover-frame-time">{formatTime(config.frame_time)}</span>
-              </div>
-            </div>
-            <div className="cover-frame-timeline">
-              <div className="cover-frame-slider-header">
-                <span className="cover-frame-slider-label">拖动选择封面帧</span>
-                <span className="cover-frame-slider-value">{formatTime(config.frame_time)}</span>
-              </div>
-              <input
-                type="range"
-                className="cover-frame-slider"
-                min={0}
-                max={Math.max(totalDuration, 1)}
-                step={0.1}
-                value={config.frame_time}
-                onChange={(e) => update({ frame_time: Number(e.target.value) })}
-              />
-              <div className="cover-frame-range">
-                <span>00:00</span>
-                <span>{formatTime(totalDuration)}</span>
-              </div>
-            </div>
-            {/* 快捷时间点 */}
-            <div className="cover-frame-quick">
-              <span className="cover-quick-label">快捷选帧：</span>
-              {[0, 0.25, 0.5, 0.75].map((ratio) => {
-                const t = totalDuration * ratio
-                return (
-                  <button
-                    key={ratio}
-                    className="cover-quick-btn"
-                    onClick={() => update({ frame_time: t })}
-                  >
-                    {formatTime(t)}
-                  </button>
-                )
-              })}
-            </div>
-          </div>
-        )}
-
-        {/* 上传封面 */}
-        {config.mode === "upload" && (
-          <div className="cover-upload-section">
-            <div
-              className={`cover-upload-area${isDragging ? " dragging" : ""}`}
-              onDragOver={(e) => {
-                e.preventDefault()
-                setIsDragging(true)
-              }}
-              onDragLeave={() => setIsDragging(false)}
-              onDrop={handleDrop}
-              onClick={() => fileInputRef.current?.click()}
-            >
-              {config.upload_url ? (
-                <div className="cover-upload-preview">
-                  <img src={config.upload_url} alt="封面预览" />
-                  <div className="cover-upload-overlay">点击更换</div>
-                </div>
-              ) : (
-                <div className="cover-upload-placeholder">
-                  <span className="cover-upload-icon">📤</span>
-                  <span className="cover-upload-text">点击或拖拽上传封面图片</span>
-                  <span className="cover-upload-hint">支持 JPG / PNG，建议 16:9 比例</span>
-                </div>
-              )}
-              <input
-                ref={fileInputRef}
-                type="file"
-                accept="image/*"
-                style={{ display: "none" }}
-                onChange={(e) => {
-                  const file = e.target.files?.[0]
-                  if (file) handleFileUpload(file)
-                }}
-              />
-            </div>
-          </div>
-        )}
-      </div>
-
-      {/* 封面预览 */}
-      <div className="cover-preview-section">
-        <div className="cover-section-title">封面预览</div>
-        <div className="cover-preview-box">
-          {config.upload_url ? (
-            <img src={config.upload_url} alt="封面预览" className="cover-preview-img" />
-          ) : (
-            <div className="cover-preview-placeholder">
-              <span className="cover-preview-icon">🖼️</span>
-              <span className="cover-preview-text">
-                {config.mode === "auto"
-                  ? "AI 智能选择"
-                  : config.mode === "frame"
-                    ? `帧 ${formatTime(config.frame_time)}`
-                    : "未上传封面"}
-              </span>
-            </div>
-          )}
-          <div className="cover-preview-ratio">16:9</div>
-        </div>
-      </div>
-
-      {/* 底部 */}
-      <div className="cover-footer">
-        <button className="cover-reset-btn" onClick={handleReset}>
-          重置封面
-        </button>
-      </div>
-    </Drawer>
-  )
-}
-
-export default CoverSelector
+export { default } from "./cover-selector"

apps/web/src/pages/editing-planner/components/cover-selector/CoverModePanels.tsx

@@ -0,0 +1,143 @@
+import React from "react"
+import type { CoverConfig } from "../../types"
+
+interface CoverAutoModeProps {
+  config: CoverConfig
+  formatTime: (s: number) => string
+  onUseAiSuggestion: () => void
+}
+
+/** 智能封面模式面板 */
+export const CoverAutoMode: React.FC<CoverAutoModeProps> = ({
+  config,
+  formatTime,
+  onUseAiSuggestion,
+}) => (
+  <div className="cover-auto-section">
+    <div className="cover-auto-desc">AI 将分析视频内容，自动选择最具吸引力的画面作为封面。</div>
+    {config.ai_suggested_time !== null ? (
+      <div className="cover-auto-suggestion">
+        <div className="cover-auto-badge">AI 推荐</div>
+        <div className="cover-auto-time">推荐时间点：{formatTime(config.ai_suggested_time)}</div>
+        <button className="cover-auto-use-btn" onClick={onUseAiSuggestion}>
+          使用此时间点
+        </button>
+      </div>
+    ) : (
+      <div className="cover-auto-pending">
+        <div className="cover-auto-spinner" />
+        <span>AI 分析中...（生成视频后自动推荐）</span>
+      </div>
+    )}
+  </div>
+)
+
+interface CoverFrameModeProps {
+  config: CoverConfig
+  totalDuration: number
+  formatTime: (s: number) => string
+  onFrameTimeChange: (time: number) => void
+}
+
+/** 抽帧选封面模式面板 */
+export const CoverFrameMode: React.FC<CoverFrameModeProps> = ({
+  config,
+  totalDuration,
+  formatTime,
+  onFrameTimeChange,
+}) => (
+  <div className="cover-frame-section">
+    <div className="cover-frame-preview">
+      <div className="cover-frame-placeholder">
+        <span className="cover-frame-icon">🎞️</span>
+        <span className="cover-frame-time">{formatTime(config.frame_time)}</span>
+      </div>
+    </div>
+    <div className="cover-frame-timeline">
+      <div className="cover-frame-slider-header">
+        <span className="cover-frame-slider-label">拖动选择封面帧</span>
+        <span className="cover-frame-slider-value">{formatTime(config.frame_time)}</span>
+      </div>
+      <input
+        type="range"
+        className="cover-frame-slider"
+        min={0}
+        max={Math.max(totalDuration, 1)}
+        step={0.1}
+        value={config.frame_time}
+        onChange={(e) => onFrameTimeChange(Number(e.target.value))}
+      />
+      <div className="cover-frame-range">
+        <span>00:00</span>
+        <span>{formatTime(totalDuration)}</span>
+      </div>
+    </div>
+    <div className="cover-frame-quick">
+      <span className="cover-quick-label">快捷选帧：</span>
+      {[0, 0.25, 0.5, 0.75].map((ratio) => {
+        const t = totalDuration * ratio
+        return (
+          <button key={ratio} className="cover-quick-btn" onClick={() => onFrameTimeChange(t)}>
+            {formatTime(t)}
+          </button>
+        )
+      })}
+    </div>
+  </div>
+)
+
+interface CoverUploadModeProps {
+  config: CoverConfig
+  isDragging: boolean
+  fileInputRef: React.RefObject<HTMLInputElement>
+  onDragOver: (e: React.DragEvent) => void
+  onDragLeave: () => void
+  onDrop: (e: React.DragEvent) => void
+  onAreaClick: () => void
+  onFileChange: (file: File) => void
+}
+
+/** 上传封面模式面板 */
+export const CoverUploadMode: React.FC<CoverUploadModeProps> = ({
+  config,
+  isDragging,
+  fileInputRef,
+  onDragOver,
+  onDragLeave,
+  onDrop,
+  onAreaClick,
+  onFileChange,
+}) => (
+  <div className="cover-upload-section">
+    <div
+      className={`cover-upload-area${isDragging ? " dragging" : ""}`}
+      onDragOver={onDragOver}
+      onDragLeave={onDragLeave}
+      onDrop={onDrop}
+      onClick={onAreaClick}
+    >
+      {config.upload_url ? (
+        <div className="cover-upload-preview">
+          <img src={config.upload_url} alt="封面预览" />
+          <div className="cover-upload-overlay">点击更换</div>
+        </div>
+      ) : (
+        <div className="cover-upload-placeholder">
+          <span className="cover-upload-icon">📤</span>
+          <span className="cover-upload-text">点击或拖拽上传封面图片</span>
+          <span className="cover-upload-hint">支持 JPG / PNG，建议 16:9 比例</span>
+        </div>
+      )}
+      <input
+        ref={fileInputRef}
+        type="file"
+        accept="image/*"
+        style={{ display: "none" }}
+        onChange={(e) => {
+          const file = e.target.files?.[0]
+          if (file) onFileChange(file)
+        }}
+      />
+    </div>
+  </div>
+)

apps/web/src/pages/editing-planner/components/cover-selector/index.tsx

@@ -0,0 +1,146 @@
+/**
+ * 封面选择器
+ * 抽帧选封面 + 上传自定义封面 + 智能封面推荐
+ */
+import React from "react"
+import { Drawer } from "antd"
+import type { CoverConfig, CoverMode } from "../../types"
+import { useCoverSelector, MODE_LABELS, MODE_ICONS } from "./useCoverSelector"
+import { CoverAutoMode, CoverFrameMode, CoverUploadMode } from "./CoverModePanels"
+
+interface CoverSelectorProps {
+  open: boolean
+  onClose: () => void
+  config: CoverConfig
+  onChange: (config: CoverConfig) => void
+  totalDuration: number
+}
+
+const CoverSelector: React.FC<CoverSelectorProps> = ({
+  open,
+  onClose,
+  config,
+  onChange,
+  totalDuration,
+}) => {
+  const {
+    fileInputRef,
+    isDragging,
+    setIsDragging,
+    update,
+    handleReset,
+    handleModeChange,
+    handleFileUpload,
+    handleDrop,
+    handleUseAiSuggestion,
+    formatTime,
+  } = useCoverSelector({ config, onChange })
+
+  return (
+    <Drawer
+      title="封面选择"
+      placement="right"
+      width={440}
+      open={open}
+      onClose={onClose}
+      className="cover-selector-drawer"
+    >
+      {/* 顶部开关 */}
+      <div className="cover-header">
+        <span className="cover-header-label">启用自定义封面</span>
+        <label className="cover-switch">
+          <input
+            type="checkbox"
+            checked={config.enabled}
+            onChange={(e) => update({ enabled: e.target.checked })}
+          />
+          <span className="cover-switch-slider" />
+        </label>
+      </div>
+
+      {/* 模式选择 */}
+      <div className="cover-mode-section">
+        <div className="cover-section-title">封面来源</div>
+        <div className="cover-mode-tabs">
+          {(["auto", "frame", "upload"] as CoverMode[]).map((m) => (
+            <button
+              key={m}
+              className={`cover-mode-tab${config.mode === m ? " active" : ""}`}
+              onClick={() => handleModeChange(m)}
+            >
+              <span className="cover-mode-icon">{MODE_ICONS[m]}</span>
+              <span className="cover-mode-label">{MODE_LABELS[m]}</span>
+            </button>
+          ))}
+        </div>
+      </div>
+
+      {/* 模式内容区 */}
+      <div className="cover-mode-content">
+        {config.mode === "auto" && (
+          <CoverAutoMode
+            config={config}
+            formatTime={formatTime}
+            onUseAiSuggestion={handleUseAiSuggestion}
+          />
+        )}
+
+        {config.mode === "frame" && (
+          <CoverFrameMode
+            config={config}
+            totalDuration={totalDuration}
+            formatTime={formatTime}
+            onFrameTimeChange={(t) => update({ frame_time: t })}
+          />
+        )}
+
+        {config.mode === "upload" && (
+          <CoverUploadMode
+            config={config}
+            isDragging={isDragging}
+            fileInputRef={fileInputRef}
+            onDragOver={(e) => {
+              e.preventDefault()
+              setIsDragging(true)
+            }}
+            onDragLeave={() => setIsDragging(false)}
+            onDrop={handleDrop}
+            onAreaClick={() => fileInputRef.current?.click()}
+            onFileChange={handleFileUpload}
+          />
+        )}
+      </div>
+
+      {/* 封面预览 */}
+      <div className="cover-preview-section">
+        <div className="cover-section-title">封面预览</div>
+        <div className="cover-preview-box">
+          {config.upload_url ? (
+            <img src={config.upload_url} alt="封面预览" className="cover-preview-img" />
+          ) : (
+            <div className="cover-preview-placeholder">
+              <span className="cover-preview-icon">🖼️</span>
+              <span className="cover-preview-text">
+                {config.mode === "auto"
+                  ? "AI 智能选择"
+                  : config.mode === "frame"
+                    ? `帧 ${formatTime(config.frame_time)}`
+                    : "未上传封面"}
+              </span>
+            </div>
+          )}
+          <div className="cover-preview-ratio">16:9</div>
+        </div>
+      </div>
+
+      {/* 底部 */}
+      <div className="cover-footer">
+        <button className="cover-reset-btn" onClick={handleReset}>
+          重置封面
+        </button>
+      </div>
+    </Drawer>
+  )
+}
+
+export default CoverSelector

apps/web/src/pages/editing-planner/components/cover-selector/useCoverSelector.ts

@@ -0,0 +1,98 @@
+import { useCallback, useRef, useState } from "react"
+import type { CoverConfig, CoverMode } from "../../types"
+import { DEFAULT_COVER_CONFIG } from "../../types"
+
+/** 封面模式标签 */
+export const MODE_LABELS: Record<CoverMode, string> = {
+  auto: "智能封面",
+  frame: "抽帧选封面",
+  upload: "上传封面",
+}
+
+/** 封面模式图标 */
+export const MODE_ICONS: Record<CoverMode, string> = {
+  auto: "🤖",
+  frame: "🎞️",
+  upload: "📤",
+}
+
+interface UseCoverSelectorOptions {
+  config: CoverConfig
+  onChange: (config: CoverConfig) => void
+}
+
+/**
+ * 封面选择器 Hook
+ * 封装状态管理、文件上传、模式切换等逻辑
+ */
+export function useCoverSelector({ config, onChange }: UseCoverSelectorOptions) {
+  const fileInputRef = useRef<HTMLInputElement>(null)
+  const [isDragging, setIsDragging] = useState(false)
+
+  const update = useCallback(
+    (partial: Partial<CoverConfig>) => {
+      onChange({ ...config, ...partial })
+    },
+    [config, onChange],
+  )
+
+  const handleReset = useCallback(() => {
+    onChange({ ...DEFAULT_COVER_CONFIG, enabled: config.enabled })
+  }, [config.enabled, onChange])
+
+  const handleModeChange = useCallback(
+    (mode: CoverMode) => {
+      update({ mode })
+    },
+    [update],
+  )
+
+  const handleFileUpload = useCallback(
+    (file: File) => {
+      if (!file.type.startsWith("image/")) return
+      const reader = new FileReader()
+      reader.onload = (e) => {
+        const url = e.target?.result as string
+        update({ upload_url: url, thumbnail_url: url, mode: "upload" })
+      }
+      reader.readAsDataURL(file)
+    },
+    [update],
+  )
+
+  const handleDrop = useCallback(
+    (e: React.DragEvent) => {
+      e.preventDefault()
+      setIsDragging(false)
+      const file = e.dataTransfer.files[0]
+      if (file) handleFileUpload(file)
+    },
+    [handleFileUpload],
+  )
+
+  const handleUseAiSuggestion = useCallback(() => {
+    if (config.ai_suggested_time !== null) {
+      update({ frame_time: config.ai_suggested_time, mode: "frame" })
+    }
+  }, [config.ai_suggested_time, update])
+
+  const formatTime = (seconds: number) => {
+    const m = Math.floor(seconds / 60)
+    const s = Math.floor(seconds % 60)
+    const ms = Math.floor((seconds % 1) * 10)
+    return `${m.toString().padStart(2, "0")}:${s.toString().padStart(2, "0")}.${ms}`
+  }
+
+  return {
+    fileInputRef,
+    isDragging,
+    setIsDragging,
+    update,
+    handleReset,
+    handleModeChange,
+    handleFileUpload,
+    handleDrop,
+    handleUseAiSuggestion,
+    formatTime,
+  }
+}