优化尺寸调整功能：添加比例选择和修复原图显示

- 添加快捷比例选择功能（智能、21:9、16:9、3:2、4:3、1:1、3:4、2:3、9:16）
- 选择比例后，输入宽度时高度自动根据比例计算
- 优化左右对比布局，减少空白，画布显示更大
- 修复点击确认调整后原图消失的问题，保持原图一直显示
- 优化工具栏布局，尺寸调整模式下显示专用工具栏

components/image-annotator.tsx

@@ -78,9 +78,68 @@ export function ImageAnnotator({ imageUrl, onConfirm, onCancel }: ImageAnnotator
   const [resizeImagePosition, setResizeImagePosition] = useState<{ x: number; y: number }>({ x: 0, y: 0 });
   const [isDraggingResize, setIsDraggingResize] = useState(false);
   const [dragStart, setDragStart] = useState<{ x: number; y: number } | null>(null);
+  const [selectedAspectRatio, setSelectedAspectRatio] = useState<string | null>(null); // 选中的比例，null表示自定义
   const resizeCanvasRef = useRef<HTMLCanvasElement>(null);
   const resizeContainerRef = useRef<HTMLDivElement>(null);
 
+  // 比例选项定义
+  const aspectRatios = [
+    { label: "智能", value: "smart", ratio: null }, // 智能：根据原图比例
+    { label: "21:9", value: "21:9", ratio: 21 / 9 },
+    { label: "16:9", value: "16:9", ratio: 16 / 9 },
+    { label: "3:2", value: "3:2", ratio: 3 / 2 },
+    { label: "4:3", value: "4:3", ratio: 4 / 3 },
+    { label: "1:1", value: "1:1", ratio: 1 / 1 },
+    { label: "3:4", value: "3:4", ratio: 3 / 4 },
+    { label: "2:3", value: "2:3", ratio: 2 / 3 },
+    { label: "9:16", value: "9:16", ratio: 9 / 16 },
+  ];
+
+  // 根据比例和宽度计算高度
+  const calculateHeightFromWidth = (width: number, ratio: number | null) => {
+    if (ratio === null) {
+      // 智能模式：使用原图比例
+      if (image) {
+        return Math.round(width * (image.height / image.width));
+      }
+      return resizeCanvasHeight; // 如果没有原图，保持当前高度
+    }
+    return Math.round(width / ratio);
+  };
+
+  // 处理宽度变化
+  const handleWidthChange = (newWidth: number) => {
+    setResizeCanvasWidth(newWidth);
+    if (selectedAspectRatio) {
+      const ratioConfig = aspectRatios.find((r) => r.value === selectedAspectRatio);
+      if (ratioConfig) {
+        const newHeight = calculateHeightFromWidth(newWidth, ratioConfig.ratio);
+        setResizeCanvasHeight(newHeight);
+      }
+    }
+  };
+
+  // 处理高度变化（如果用户手动修改高度，取消比例锁定）
+  const handleHeightChange = (newHeight: number) => {
+    setResizeCanvasHeight(newHeight);
+    // 如果用户手动修改高度，取消比例锁定
+    if (selectedAspectRatio) {
+      setSelectedAspectRatio(null);
+    }
+  };
+
+  // 处理比例选择
+  const handleAspectRatioSelect = (value: string | null) => {
+    setSelectedAspectRatio(value);
+    if (value) {
+      const ratioConfig = aspectRatios.find((r) => r.value === value);
+      if (ratioConfig) {
+        const newHeight = calculateHeightFromWidth(resizeCanvasWidth, ratioConfig.ratio);
+        setResizeCanvasHeight(newHeight);
+      }
+    }
+  };
+
   // 确保在客户端渲染
   useEffect(() => {
     setMounted(true);
@@ -467,6 +526,7 @@ export function ImageAnnotator({ imageUrl, onConfirm, onCancel }: ImageAnnotator
     // 初始化尺寸为原图尺寸
     setResizeCanvasWidth(image.width);
     setResizeCanvasHeight(image.height);
+    setSelectedAspectRatio(null); // 重置比例选择
     // 初始化图片位置为画布中心
     setResizeImagePosition({ x: 0, y: 0 });
     setResizeImageScale(1);
@@ -687,7 +747,8 @@ export function ImageAnnotator({ imageUrl, onConfirm, onCancel }: ImageAnnotator
         }
         setProcessedImageBase64(base64Data);
         setProcessType("resize");
-        setIsResizeMode(false);
+        // 不退出尺寸调整模式，保持原图显示
+        // setIsResizeMode(false);
         
         toast.success(`尺寸调整完成！图片已调整为 ${resizeCanvasWidth}x${resizeCanvasHeight} 像素，已保存到相册`);
       } else {
@@ -969,89 +1030,127 @@ export function ImageAnnotator({ imageUrl, onConfirm, onCancel }: ImageAnnotator
         {/* 工具选择栏 / 尺寸调整工具栏 */}
         {isResizeMode ? (
           /* 尺寸调整模式下显示尺寸调整工具栏 */
-          <div className="flex items-center gap-4 border-b px-4 py-3 bg-muted/30">
+          <div className="flex flex-col gap-3 border-b px-4 py-3 bg-muted/30">
+            {/* 比例选择 */}
             <div className="flex items-center gap-2">
-              <label className="text-sm font-medium">宽度:</label>
+              <label className="text-sm font-medium whitespace-nowrap">选择比例:</label>
-              <Input
+              <div className="flex items-center gap-2 overflow-x-auto pb-1">
-                type="number"
+                {aspectRatios.map((ratio) => (
-                value={resizeCanvasWidth}
+                  <button
-                onChange={(e) => setResizeCanvasWidth(Number.parseInt(e.target.value) || 1)}
+                    key={ratio.value}
-                className="w-24 h-8"
+                    type="button"
-                min={1}
+                    onClick={() => handleAspectRatioSelect(ratio.value === selectedAspectRatio ? null : ratio.value)}
-                max={10000}
+                    className={`flex flex-col items-center justify-center gap-1 px-3 py-2 rounded-lg border transition-colors whitespace-nowrap ${
-              />
+                      selectedAspectRatio === ratio.value
-              <span className="text-xs text-muted-foreground">px</span>
+                        ? "bg-primary text-primary-foreground border-primary"
+                        : "bg-background hover:bg-muted border-border"
+                    }`}
+                    title={ratio.label}
+                  >
+                    <div
+                      className={`border-2 rounded flex items-center justify-center ${
+                        selectedAspectRatio === ratio.value ? "border-primary-foreground" : "border-foreground"
+                      }`}
+                      style={{
+                        width: ratio.value === "smart" ? "16px" : ratio.ratio && ratio.ratio > 1 ? "24px" : ratio.ratio && ratio.ratio < 1 ? "12px" : "16px",
+                        height: ratio.value === "smart" ? "16px" : ratio.ratio && ratio.ratio > 1 ? "12px" : ratio.ratio && ratio.ratio < 1 ? "24px" : "16px",
+                      }}
+                    >
+                      {ratio.value === "smart" && (
+                        <Maximize2 className="h-3 w-3" />
+                      )}
+                    </div>
+                    <span className="text-xs">{ratio.label}</span>
+                  </button>
+                ))}
+              </div>
             </div>
-            <div className="flex items-center gap-2">
+            
-              <label className="text-sm font-medium">高度:</label>
+            {/* 尺寸输入 */}
-              <Input
+            <div className="flex items-center gap-4">
-                type="number"
+              <div className="flex items-center gap-2">
-                value={resizeCanvasHeight}
+                <label className="text-sm font-medium">宽度:</label>
-                onChange={(e) => setResizeCanvasHeight(Number.parseInt(e.target.value) || 1)}
+                <Input
-                className="w-24 h-8"
+                  type="number"
-                min={1}
+                  value={resizeCanvasWidth}
-                max={10000}
+                  onChange={(e) => handleWidthChange(Number.parseInt(e.target.value) || 1)}
-              />
+                  className="w-24 h-8"
-              <span className="text-xs text-muted-foreground">px</span>
+                  min={1}
-            </div>
+                  max={10000}
-            <div className="flex items-center gap-2">
-              <label className="text-sm font-medium">背景:</label>
-              <input
-                type="color"
-                value={resizeBackgroundColor}
-                onChange={(e) => setResizeBackgroundColor(e.target.value)}
-                disabled={resizeBackgroundTransparent}
-                className="w-12 h-8 rounded border cursor-pointer disabled:opacity-50"
-              />
-            </div>
-            <div className="flex items-center gap-2">
-              <label className="text-sm font-medium flex items-center gap-1">
-                <input
-                  type="checkbox"
-                  checked={resizeBackgroundTransparent}
-                  onChange={(e) => setResizeBackgroundTransparent(e.target.checked)}
-                  className="w-4 h-4"
                 />
-                透明
+                <span className="text-xs text-muted-foreground">px</span>
-              </label>
+              </div>
-            </div>
+              <div className="flex items-center gap-2">
-            <div className="flex items-center gap-2 ml-auto">
+                <label className="text-sm font-medium">高度:</label>
-              <Button
+                <Input
-                variant="outline"
+                  type="number"
-                size="sm"
+                  value={resizeCanvasHeight}
-                onClick={handleResizeZoomOut}
+                  onChange={(e) => handleHeightChange(Number.parseInt(e.target.value) || 1)}
-                title="缩小"
+                  className="w-24 h-8"
-                className="h-8 w-8 p-0"
+                  min={1}
-              >
+                  max={10000}
-                <ZoomOut className="h-4 w-4" />
+                />
-              </Button>
+                <span className="text-xs text-muted-foreground">px</span>
-              <Button
+              </div>
-                variant="outline"
+              <div className="flex items-center gap-2">
-                size="sm"
+                <label className="text-sm font-medium">背景:</label>
-                onClick={handleResizeZoomIn}
+                <input
-                title="放大"
+                  type="color"
-                className="h-8 w-8 p-0"
+                  value={resizeBackgroundColor}
-              >
+                  onChange={(e) => setResizeBackgroundColor(e.target.value)}
-                <ZoomIn className="h-4 w-4" />
+                  disabled={resizeBackgroundTransparent}
-              </Button>
+                  className="w-12 h-8 rounded border cursor-pointer disabled:opacity-50"
-              <Button
+                />
-                variant="ghost"
+              </div>
-                size="sm"
+              <div className="flex items-center gap-2">
-                onClick={() => {
+                <label className="text-sm font-medium flex items-center gap-1">
-                  setIsResizeMode(false);
+                  <input
-                  setResizeImageScale(1);
+                    type="checkbox"
-                  setResizeImagePosition({ x: 0, y: 0 });
+                    checked={resizeBackgroundTransparent}
-                }}
+                    onChange={(e) => setResizeBackgroundTransparent(e.target.checked)}
-              >
+                    className="w-4 h-4"
-                取消
+                  />
-              </Button>
+                  透明
-              <Button
+                </label>
-                size="sm"
+              </div>
-                onClick={handleResizeConfirm}
+              <div className="flex items-center gap-2 ml-auto">
-                className="bg-primary text-primary-foreground hover:bg-primary/90"
+                <Button
-              >
+                  variant="outline"
-                确认调整
+                  size="sm"
-              </Button>
+                  onClick={handleResizeZoomOut}
+                  title="缩小"
+                  className="h-8 w-8 p-0"
+                >
+                  <ZoomOut className="h-4 w-4" />
+                </Button>
+                <Button
+                  variant="outline"
+                  size="sm"
+                  onClick={handleResizeZoomIn}
+                  title="放大"
+                  className="h-8 w-8 p-0"
+                >
+                  <ZoomIn className="h-4 w-4" />
+                </Button>
+                <Button
+                  variant="ghost"
+                  size="sm"
+                  onClick={() => {
+                    setIsResizeMode(false);
+                    setResizeImageScale(1);
+                    setResizeImagePosition({ x: 0, y: 0 });
+                  }}
+                >
+                  取消
+                </Button>
+                <Button
+                  size="sm"
+                  onClick={handleResizeConfirm}
+                  className="bg-primary text-primary-foreground hover:bg-primary/90"
+                >
+                  确认调整
+                </Button>
+              </div>
             </div>
           </div>
         ) : (
@@ -1125,7 +1224,7 @@ export function ImageAnnotator({ imageUrl, onConfirm, onCancel }: ImageAnnotator
         )}
 
         {/* 画布区域 - 并排显示原图和处理后的图片 */}
-        <div ref={containerRef} className="flex flex-1 items-center justify-center gap-4 overflow-hidden bg-muted/30 p-4">
+        <div ref={containerRef} className="flex flex-1 items-center justify-center gap-2 overflow-hidden bg-muted/30 p-2">
           {isLoading ? (
             /* 加载动画 */
             <div className="flex flex-col items-center justify-center gap-3">
@@ -1149,26 +1248,32 @@ export function ImageAnnotator({ imageUrl, onConfirm, onCancel }: ImageAnnotator
             /* 尺寸调整模式 - 左右对比布局 */
             <>
               {/* 左侧：原图 */}
-              <div className="flex flex-1 flex-col border-2 border-dashed border-border rounded-lg bg-muted/20 p-4 overflow-hidden">
+              <div className="flex flex-1 flex-col border-2 border-dashed border-border rounded-lg bg-muted/20 p-2 overflow-hidden">
-                <div className="mb-2 text-sm font-medium text-muted-foreground text-center">原图</div>
+                <div className="mb-1 text-xs font-medium text-muted-foreground text-center">原图</div>
-                <div className="flex-1 flex items-center justify-center overflow-auto">
+                <div className="flex-1 flex items-center justify-center overflow-auto min-h-0">
                   {image && (
                     <img
                       src={image.src}
                       alt="原图"
                       className="max-w-full max-h-full rounded-lg shadow-lg"
-                      style={{ objectFit: "contain" }}
+                      style={{ 
+                        objectFit: "contain",
+                        maxWidth: "100%",
+                        maxHeight: "100%",
+                        width: "auto",
+                        height: "auto"
+                      }}
                     />
                   )}
                 </div>
               </div>
               
               {/* 右侧：尺寸调整预览画布 */}
-              <div className="flex flex-1 flex-col border-2 border-dashed border-primary/50 rounded-lg bg-muted/30 p-4 overflow-hidden">
+              <div className="flex flex-1 flex-col border-2 border-dashed border-primary/50 rounded-lg bg-muted/30 p-2 overflow-hidden">
-                <div className="mb-2 text-sm font-medium text-muted-foreground text-center">调整尺寸</div>
+                <div className="mb-1 text-xs font-medium text-muted-foreground text-center">调整尺寸</div>
                 <div 
                   ref={resizeContainerRef}
-                  className="flex-1 flex items-center justify-center overflow-auto"
+                  className="flex-1 flex items-center justify-center overflow-auto min-h-0"
                   onWheel={handleResizeImageWheel}
                 >
                   <div className="relative inline-block">