feat: 多页面拖拽上传、滚动条精简、UI优化

- 剧本评测/分辨率提升/数字人/角色迁移/图片工作台/去水印/电商：新增外部拖拽文件上传
- 电商：爆款图复刻上传框支持拖拽+大滚动条，短视频/模特图/详情图滚动条精简回退
- 图片工作台：右侧输出面板移至左侧提示词上方，删除局部重绘遮罩/结果框
- 数字人：生成按钮改为「开始生成」
- 局部重绘：编辑遮罩→编辑页面
- 对话框生成器：新增对话/视频模式、模型/速度/深度选择按钮
- 视频时长默认改为5秒
- 工具箱页面空状态logo统一绿底亮色图标
- 多处CSS滚动条和布局优化

src/features/resolution-upscale/ResolutionUpscalePage.tsx

@@ -15,7 +15,7 @@ import {
   ThunderboltOutlined,
   VideoCameraOutlined,
 } from "@ant-design/icons";
-import { useCallback, useEffect, useRef, useState } from "react";
+import { useCallback, useEffect, useRef, useState, type DragEvent } from "react";
 import { aiGenerationClient } from "../../api/aiGenerationClient";
 import { waitForTask } from "../../api/taskSubscription";
 import { saveToolTaskState, loadToolTaskState, clearToolTaskState } from "../workbench/toolKeepalive";
@@ -87,6 +87,7 @@ function ResolutionUpscalePage({
   const [isProcessing, setIsProcessing] = useState(false);
   const [isDownloading, setIsDownloading] = useState(false);
   const [isSavingAsset, setIsSavingAsset] = useState(false);
+  const [isDragging, setIsDragging] = useState(false);
   const activeTaskIdRef = useRef(activeTaskId);
   activeTaskIdRef.current = activeTaskId;
   const keepaliveRestoredRef = useRef(false);
@@ -164,6 +165,24 @@ function ResolutionUpscalePage({
     event.currentTarget.value = "";
   };
 
+  const processDroppedFile = (file: File) => {
+    if (sourcePreview.startsWith("blob:")) URL.revokeObjectURL(sourcePreview);
+    setSourceName(file.name);
+    setSourceFile(file);
+    setSourceUrl("");
+    setSourcePreview(URL.createObjectURL(file));
+    setResultPreview("");
+    setSourceDimensions(null);
+    setVideoViewMode("source");
+    setActiveTaskId("");
+    setTaskProgress(0);
+    setStatus(`已导入 ${file.name}`);
+  };
+
+  const handleDragOver = (e: DragEvent<HTMLDivElement>) => { e.preventDefault(); e.stopPropagation(); if (e.dataTransfer.types.includes("Files")) setIsDragging(true); };
+  const handleDragLeave = (e: DragEvent<HTMLDivElement>) => { e.preventDefault(); e.stopPropagation(); if (e.currentTarget === e.target || !e.currentTarget.contains(e.relatedTarget as Node)) setIsDragging(false); };
+  const handleDrop = (e: DragEvent<HTMLDivElement>) => { e.preventDefault(); e.stopPropagation(); setIsDragging(false); const file = e.dataTransfer.files[0]; if (file) processDroppedFile(file); };
+
   const handleImportUrl = () => {
     const normalizedUrl = sourceUrl.trim();
     if (!/^https?:\/\//i.test(normalizedUrl)) {
@@ -405,7 +424,13 @@ function ResolutionUpscalePage({
               accept={mode === "image" ? "image/png,image/jpeg,image/webp" : "video/mp4,video/quicktime,video/webm,video/*"}
               onChange={handleFileChange}
             />
-            <div className="image-workbench-upload-shell">
+            <div
+              className={`image-workbench-upload-shell${isDragging ? " is-dragging" : ""}`}
+              onDragOver={handleDragOver}
+              onDragLeave={handleDragLeave}
+              onDrop={handleDrop}
+            >
+              {isDragging ? <div className="image-workbench-upload-drop-overlay"><span>释放文件以上传</span></div> : null}
               <button type="button" className="image-workbench-upload" onClick={() => fileInputRef.current?.click()}>
                 {sourcePreview && mode === "image" ? <img src={sourcePreview} alt="" /> : <FileImageOutlined />}
                 <strong>{sourceName || (mode === "image" ? "选择图片" : "选择视频")}</strong>
@@ -574,11 +599,13 @@ function ResolutionUpscalePage({
               </div>
             )
           ) : (
-            <button type="button" className="image-workbench-empty image-workbench-empty--button" onClick={() => fileInputRef.current?.click()}>
-              <ColumnWidthOutlined />
-              <strong>{mode === "image" ? "拖拽或选择图片" : "拖拽或选择视频"}</strong>
-              <span>{mode === "image" ? "支持 PNG / JPG / WebP" : "支持 MP4 / MOV / WebM"}</span>
-            </button>
+            <div className="studio-canvas-ghost">
+              <div className="studio-canvas-ghost__icon">
+                <ThunderboltOutlined />
+              </div>
+              <div className="studio-canvas-ghost__title">{mode === "image" ? "拖拽或选择图片" : "拖拽或选择视频"}</div>
+              <div className="studio-canvas-ghost__hint">{mode === "image" ? "支持 PNG / JPG / WebP" : "支持 MP4 / MOV / WebM"}</div>
+            </div>
           )}
         </section>
       </main>