优化Modal弹框布局和尺寸控制

- 修复Modal组件尺寸类冲突问题，确保max-w-*正确生效
- 优化CreateDynamicModal表单布局，使其在小尺寸弹框中更紧凑
- 减少表单元素间距和内边距，提升视觉密度
- 优化图片预览、按钮等组件尺寸，适配sm尺寸弹框
- 移除CSS中可能干扰Tailwind尺寸类的样式设置

主要改进：
- Modal组件getSizeClasses函数优化，确保w-full和max-w-*正确配合
- CreateDynamicModal表单元素紧凑化，提升小屏幕体验
- 统一弹框尺寸控制逻辑，解决宽度限制不生效问题

apps/desktop/src/components/CreateDynamicModal.tsx

@@ -120,7 +120,7 @@ const CreateDynamicModal: React.FC<CreateDynamicModalProps> = ({
     >
       {/* 表单内容 */}
       <form onSubmit={handleSubmit} className="flex flex-col h-full">
-        <div className="flex-1 p-6 space-y-6 overflow-y-auto">
+        <div className="flex-1 p-4 space-y-4 overflow-y-auto">
 
           {/* 提示词 */}
           <div>
@@ -132,8 +132,8 @@ const CreateDynamicModal: React.FC<CreateDynamicModalProps> = ({
               value={formData.prompt}
               onChange={(e) => handleInputChange('prompt', e.target.value)}
               placeholder="描述您希望生成的视频内容..."
-              rows={4}
-              className={`w-full px-3 py-2 border rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-primary-500 transition-colors resize-none ${errors.prompt ? 'border-red-300' : 'border-gray-300'
+              rows={3}
+              className={`w-full px-3 py-2 border rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-primary-500 transition-colors resize-none text-sm ${errors.prompt ? 'border-red-300' : 'border-gray-300'
                 }`}
             />
             {errors.prompt && (
@@ -147,18 +147,18 @@ const CreateDynamicModal: React.FC<CreateDynamicModalProps> = ({
               <PhotoIcon className="h-4 w-4" />
               源图片 *
             </label>
-            <div className="space-y-3">
+            <div className="space-y-2">
               <button
                 type="button"
                 onClick={handleImageSelect}
-                className={`w-full p-4 border-2 border-dashed rounded-lg transition-colors ${errors.source_image_path
+                className={`w-full p-3 border-2 border-dashed rounded-lg transition-colors ${errors.source_image_path
                   ? 'border-red-300 bg-red-50'
                   : 'border-gray-300 hover:border-primary-400 hover:bg-primary-50'
                   }`}
               >
-                <div className="flex flex-col items-center gap-2">
-                  <PhotoIcon className="h-8 w-8 text-gray-400" />
-                  <span className="text-sm text-gray-600">点击选择图片</span>
+                <div className="flex items-center justify-center gap-2">
+                  <PhotoIcon className="h-5 w-5 text-gray-400" />
+                  <span className="text-sm text-gray-600">选择图片</span>
                 </div>
               </button>
 
@@ -167,14 +167,14 @@ const CreateDynamicModal: React.FC<CreateDynamicModalProps> = ({
                   <img
                     src={formData.source_image_path}
                     alt="源图片预览"
-                    className="w-full h-48 object-contain bg-gray-50 rounded-lg"
+                    className="w-full h-32 object-contain bg-gray-50 rounded-lg"
                   />
                   <button
                     type="button"
                     onClick={() => handleInputChange('source_image_path', '')}
-                    className="absolute top-2 right-2 p-1 bg-red-500 text-white rounded-full hover:bg-red-600 transition-colors"
+                    className="absolute top-1 right-1 p-1 bg-red-500 text-white rounded-full hover:bg-red-600 transition-colors"
                   >
-                    <XMarkIcon className="h-4 w-4" />
+                    <XMarkIcon className="h-3 w-3" />
                   </button>
                 </div>
               )}
@@ -194,7 +194,7 @@ const CreateDynamicModal: React.FC<CreateDynamicModalProps> = ({
             <select
               value={formData.ai_model}
               onChange={(e) => handleInputChange('ai_model', e.target.value)}
-              className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-primary-500 transition-colors"
+              className="w-full px-3 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-primary-500 transition-colors text-sm"
             >
               {aiModelOptions.map((option) => (
                 <option key={option.id} value={option.name} disabled={!option.is_available}>
@@ -210,7 +210,7 @@ const CreateDynamicModal: React.FC<CreateDynamicModalProps> = ({
               <VideoCameraIcon className="h-4 w-4" />
               生成视频个数
             </label>
-            <div className="flex items-center gap-4">
+            <div className="flex items-center gap-3">
               <input
                 type="range"
                 min="1"
@@ -219,9 +219,12 @@ const CreateDynamicModal: React.FC<CreateDynamicModalProps> = ({
                 onChange={(e) => handleInputChange('video_count', parseInt(e.target.value))}
                 className="flex-1"
               />
-              <span className="text-sm font-medium text-gray-700 min-w-[2rem]">
+              <div className="flex items-center gap-1">
+                <span className="text-sm font-medium text-gray-700">
                   {formData.video_count}
                 </span>
+                <span className="text-xs text-gray-500">个</span>
+              </div>
             </div>
             {errors.video_count && (
               <p className="mt-1 text-sm text-red-600">{errors.video_count}</p>
@@ -230,18 +233,18 @@ const CreateDynamicModal: React.FC<CreateDynamicModalProps> = ({
         </div>
 
         {/* 底部按钮 */}
-        <div className="flex items-center justify-end gap-3 p-6 border-t border-gray-200">
+        <div className="flex items-center justify-end gap-3 p-4 border-t border-gray-200">
           <button
             type="button"
             onClick={onCancel}
-            className="px-4 py-2 text-gray-700 hover:bg-gray-100 rounded-lg transition-colors"
+            className="px-3 py-2 text-sm text-gray-700 hover:bg-gray-100 rounded-lg transition-colors"
           >
             取消
           </button>
           <button
             onClick={handleSubmit}
             disabled={isSubmitting}
-            className="px-6 py-2 bg-gradient-to-r from-primary-500 to-primary-600 text-white rounded-lg hover:from-primary-600 hover:to-primary-700 transition-all duration-200 shadow-sm hover:shadow-md font-medium disabled:opacity-50 disabled:cursor-not-allowed"
+            className="px-4 py-2 text-sm bg-gradient-to-r from-primary-500 to-primary-600 text-white rounded-lg hover:from-primary-600 hover:to-primary-700 transition-all duration-200 shadow-sm hover:shadow-md font-medium disabled:opacity-50 disabled:cursor-not-allowed"
           >
             {isSubmitting ? '生成中...' : '开始生成'}
           </button>

apps/desktop/src/components/Modal.tsx

@@ -88,11 +88,11 @@ export const Modal: React.FC<ModalProps> = ({
 
   const getSizeClasses = () => {
     const sizeMap = {
-      sm: 'max-w-md',
-      md: 'max-w-lg',
-      lg: 'max-w-2xl',
-      xl: 'max-w-4xl',
-      full: 'max-w-7xl',
+      sm: 'w-full max-w-md',
+      md: 'w-full max-w-lg',
+      lg: 'w-full max-w-2xl',
+      xl: 'w-full max-w-4xl',
+      full: 'w-full max-w-7xl',
     };
     return sizeMap[size];
   };
@@ -141,7 +141,7 @@ export const Modal: React.FC<ModalProps> = ({
       {/* 弹框容器 */}
       <div
         ref={modalRef}
-        className={`modal-container ${size === 'xl' || size === 'full' ? 'large' : ''} ${getSizeClasses()} w-full max-h-[90vh] animate-modal-scale-in relative z-10 ${className}`}
+        className={`modal-container ${size === 'xl' || size === 'full' ? 'large' : ''} ${getSizeClasses()} max-h-[90vh] animate-modal-scale-in relative z-10 ${className}`}
       >
         {/* 头部 */}
         {(title || subtitle || icon || showCloseButton) && (

apps/desktop/src/styles/design-system.css

@@ -907,7 +907,6 @@
   overflow: hidden;
   transform-origin: center;
   transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
-  max-width: 100%;
   margin: 0 auto;
   z-index: 1;