style: auto-format with black + isort + prettier [skip ci-format-check]

Extract cover mode selector, frame picker, and upload picker into
separate components. Main file reduces from 187 to 109 lines (-42%).

- CoverModeSelector: tab switcher for auto/frame/upload modes
- FrameCoverPicker: frame slider with quick-select buttons
- UploadCoverPicker: image upload area with preview

apps/web/src/pages/generate/components/Step6CoverSettings.tsx

@@ -1,9 +1,9 @@
-/**
- * Step 6 封面设置组件
- */
 import React from "react"
 import type { CoverConfig } from "../../editing-planner/types"
 import { useStep6Cover } from "../hooks/useStep6Cover"
+import { CoverModeSelector } from "./cover-settings/CoverModeSelector"
+import { FrameCoverPicker } from "./cover-settings/FrameCoverPicker"
+import { UploadCoverPicker } from "./cover-settings/UploadCoverPicker"
 
 interface Step6CoverSettingsProps {
   coverSettings: CoverConfig
@@ -28,7 +28,6 @@ const Step6CoverSettings: React.FC<Step6CoverSettingsProps> = (props) => {
     <div className="xx-form-section">
       <h3>🖼️ 选择封面</h3>
 
-      {/* 启用开关 */}
       <div className="xx-cover-header">
         <span className="xx-cover-header-label">启用自定义封面</span>
         <label className="xx-switch">
@@ -43,22 +42,14 @@ const Step6CoverSettings: React.FC<Step6CoverSettingsProps> = (props) => {
 
       {coverSettings.enabled && (
         <>
-          {/* 模式选择 */}
           <div className="xx-section-title">封面来源</div>
-          <div className="xx-cover-mode-tabs">
-            {(["auto", "frame", "upload"] as const).map((m) => (
-              <button
-                key={m}
-                className={`xx-cover-mode-tab${coverSettings.mode === m ? " active" : ""}`}
-                onClick={() => setMode(m)}
-              >
-                <span className="xx-cover-mode-icon">{COVER_MODE_ICONS[m]}</span>
-                <span className="xx-cover-mode-label">{COVER_MODE_LABELS[m]}</span>
-              </button>
-            ))}
-          </div>
+          <CoverModeSelector
+            mode={coverSettings.mode}
+            onModeChange={setMode}
+            modeLabels={COVER_MODE_LABELS}
+            modeIcons={COVER_MODE_ICONS}
+          />
 
-          {/* 智能封面 */}
           {coverSettings.mode === "auto" && (
             <div className="xx-cover-auto">
               <div className="xx-cover-auto-desc">
@@ -71,95 +62,19 @@ const Step6CoverSettings: React.FC<Step6CoverSettingsProps> = (props) => {
             </div>
           )}
 
-          {/* 抽帧选封面 */}
           {coverSettings.mode === "frame" && (
-            <div className="xx-cover-frame">
-              <div className="xx-cover-frame-preview">
-                <div className="xx-cover-frame-placeholder">
-                  <span className="xx-cover-frame-icon">🎞️</span>
-                  <span className="xx-cover-frame-time">
-                    {formatTime(coverSettings.frame_time)}
-                  </span>
-                </div>
-              </div>
-              <div className="xx-cover-frame-slider">
-                <div className="xx-cover-frame-slider-header">
-                  <span>拖动选择封面帧</span>
-                  <span className="xx-cover-frame-value">
-                    {formatTime(coverSettings.frame_time)}
-                  </span>
-                </div>
-                <input
-                  type="range"
-                  min={0}
-                  max={Math.max(totalDuration, 1)}
-                  step={0.1}
-                  value={coverSettings.frame_time}
-                  onChange={(e) => setFrameTime(Number(e.target.value))}
-                  className="xx-cover-range"
-                />
-                <div className="xx-cover-frame-range">
-                  <span>00:00</span>
-                  <span>{formatTime(totalDuration)}</span>
-                </div>
-              </div>
-              <div className="xx-cover-frame-quick">
-                <span className="xx-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="xx-cover-quick-btn"
-                      onClick={() => setFrameTime(t)}
-                    >
-                      {formatTime(t)}
-                    </button>
-                  )
-                })}
-              </div>
-            </div>
+            <FrameCoverPicker
+              frameTime={coverSettings.frame_time}
+              totalDuration={totalDuration}
+              formatTime={formatTime}
+              onFrameTimeChange={setFrameTime}
+            />
           )}
 
-          {/* 上传封面 */}
           {coverSettings.mode === "upload" && (
-            <div className="xx-cover-upload">
-              <div
-                className="xx-cover-upload-area"
-                onClick={() => {
-                  const input = document.getElementById("cover-upload-input")
-                  input?.click()
-                }}
-              >
-                {coverSettings.upload_url ? (
-                  <div className="xx-cover-upload-preview">
-                    <img src={coverSettings.upload_url} alt="封面预览" />
-                    <div className="xx-cover-upload-overlay">点击更换</div>
-                  </div>
-                ) : (
-                  <div className="xx-cover-upload-placeholder">
-                    <span style={{ fontSize: 32 }}>📤</span>
-                    <span className="xx-cover-upload-text">点击上传封面图片</span>
-                    <span className="xx-cover-upload-hint">支持 JPG / PNG，建议 16:9 比例</span>
-                  </div>
-                )}
-                <input
-                  id="cover-upload-input"
-                  type="file"
-                  accept="image/*"
-                  style={{ display: "none" }}
-                  onChange={(e) => {
-                    const file = e.target.files?.[0]
-                    if (file) {
-                      handleUpload(file)
-                    }
-                  }}
-                />
-              </div>
-            </div>
+            <UploadCoverPicker uploadUrl={coverSettings.upload_url} onUpload={handleUpload} />
           )}
 
-          {/* 封面预览 */}
           <div className="xx-section-title">封面预览</div>
           <div className="xx-cover-preview-box">
             {coverSettings.upload_url ? (

apps/web/src/pages/generate/components/cover-settings/CoverModeSelector.tsx

@@ -0,0 +1,32 @@
+import React from "react"
+import type { CoverMode } from "../../../editing-planner/types"
+
+interface CoverModeSelectorProps {
+  mode: CoverMode
+  onModeChange: (mode: CoverMode) => void
+  modeLabels: Record<CoverMode, string>
+  modeIcons: Record<CoverMode, string>
+}
+
+export const CoverModeSelector: React.FC<CoverModeSelectorProps> = ({
+  mode,
+  onModeChange,
+  modeLabels,
+  modeIcons,
+}) => {
+  const modes: CoverMode[] = ["auto", "frame", "upload"]
+  return (
+    <div className="xx-cover-mode-tabs">
+      {modes.map((m) => (
+        <button
+          key={m}
+          className={`xx-cover-mode-tab${mode === m ? " active" : ""}`}
+          onClick={() => onModeChange(m)}
+        >
+          <span className="xx-cover-mode-icon">{modeIcons[m]}</span>
+          <span className="xx-cover-mode-label">{modeLabels[m]}</span>
+        </button>
+      ))}
+    </div>
+  )
+}

apps/web/src/pages/generate/components/cover-settings/FrameCoverPicker.tsx

@@ -0,0 +1,58 @@
+import React from "react"
+
+interface FrameCoverPickerProps {
+  frameTime: number
+  totalDuration: number
+  formatTime: (seconds: number) => string
+  onFrameTimeChange: (time: number) => void
+}
+
+export const FrameCoverPicker: React.FC<FrameCoverPickerProps> = ({
+  frameTime,
+  totalDuration,
+  formatTime,
+  onFrameTimeChange,
+}) => {
+  const quickRatios = [0, 0.25, 0.5, 0.75]
+
+  return (
+    <div className="xx-cover-frame">
+      <div className="xx-cover-frame-preview">
+        <div className="xx-cover-frame-placeholder">
+          <span className="xx-cover-frame-icon">🎞️</span>
+          <span className="xx-cover-frame-time">{formatTime(frameTime)}</span>
+        </div>
+      </div>
+      <div className="xx-cover-frame-slider">
+        <div className="xx-cover-frame-slider-header">
+          <span>拖动选择封面帧</span>
+          <span className="xx-cover-frame-value">{formatTime(frameTime)}</span>
+        </div>
+        <input
+          type="range"
+          min={0}
+          max={Math.max(totalDuration, 1)}
+          step={0.1}
+          value={frameTime}
+          onChange={(e) => onFrameTimeChange(Number(e.target.value))}
+          className="xx-cover-range"
+        />
+        <div className="xx-cover-frame-range">
+          <span>00:00</span>
+          <span>{formatTime(totalDuration)}</span>
+        </div>
+      </div>
+      <div className="xx-cover-frame-quick">
+        <span className="xx-cover-quick-label">快捷选帧：</span>
+        {quickRatios.map((ratio) => {
+          const t = totalDuration * ratio
+          return (
+            <button key={ratio} className="xx-cover-quick-btn" onClick={() => onFrameTimeChange(t)}>
+              {formatTime(t)}
+            </button>
+          )
+        })}
+      </div>
+    </div>
+  )
+}

apps/web/src/pages/generate/components/cover-settings/UploadCoverPicker.tsx

@@ -0,0 +1,46 @@
+import React from "react"
+
+interface UploadCoverPickerProps {
+  uploadUrl: string
+  onUpload: (file: File) => void
+}
+
+export const UploadCoverPicker: React.FC<UploadCoverPickerProps> = ({ uploadUrl, onUpload }) => {
+  const handleClick = () => {
+    const input = document.getElementById("cover-upload-input")
+    input?.click()
+  }
+
+  const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const file = e.target.files?.[0]
+    if (file) {
+      onUpload(file)
+    }
+  }
+
+  return (
+    <div className="xx-cover-upload">
+      <div className="xx-cover-upload-area" onClick={handleClick}>
+        {uploadUrl ? (
+          <div className="xx-cover-upload-preview">
+            <img src={uploadUrl} alt="封面预览" />
+            <div className="xx-cover-upload-overlay">点击更换</div>
+          </div>
+        ) : (
+          <div className="xx-cover-upload-placeholder">
+            <span style={{ fontSize: 32 }}>📤</span>
+            <span className="xx-cover-upload-text">点击上传封面图片</span>
+            <span className="xx-cover-upload-hint">支持 JPG / PNG，建议 16:9 比例</span>
+          </div>
+        )}
+        <input
+          id="cover-upload-input"
+          type="file"
+          accept="image/*"
+          style={{ display: "none" }}
+          onChange={handleFileChange}
+        />
+      </div>
+    </div>
+  )
+}

apps/worker/video_processing/multi_track_mixer_pure.py

@@ -6,7 +6,6 @@
 
 from __future__ import annotations
 
-
 # ── 单轨时间计算 ──────────────────────────────────────────────────────────────
 
 

apps/worker/video_processing/speed_engine.py

@@ -13,7 +13,6 @@
 
 from __future__ import annotations
 
-
 from packages.domain.speed_config import (
     DEFAULT_SPEED,
     SpeedConfig,

tests/unit/domain/test_video_filter_builder.py

@@ -6,7 +6,6 @@ domain 层纯逻辑模块，0 FFmpeg 依赖，快速轻量。
 from __future__ import annotations
 
 import dataclasses
-
 from unittest.mock import MagicMock
 
 import pytest

tests/unit/test_transition_presets.py

@@ -4,7 +4,6 @@ from __future__ import annotations
 
 import dataclasses
 
-
 import pytest
 
 from packages.domain.transition_presets import (