feat:更新主题色适配

lib/widgets/common/image.dart

@@ -203,7 +203,12 @@ class ImagePreview extends StatelessWidget {
   }
 }
 
-Widget buildImageUploadButton({required VoidCallback onTap}) {
+Widget buildImageUploadButton({
+  required BuildContext context,
+  required VoidCallback onTap,
+}) {
+  final colors = Theme.of(context).colorScheme;
+
   return InkWell(
     onTap: onTap,
     borderRadius: BorderRadius.circular(8),
@@ -211,16 +216,16 @@ Widget buildImageUploadButton({required VoidCallback onTap}) {
       width: 96,
       height: 96,
       decoration: BoxDecoration(
-        color: Colors.white,
+        color: colors.surface,
         borderRadius: BorderRadius.circular(8),
         border: Border.all(color: Colors.black),
       ),
-      child: const Column(
+      child: Column(
         mainAxisAlignment: MainAxisAlignment.center,
         children: [
-          Icon(Icons.add, color: Color(0xFF86909C)),
+          Icon(Icons.add, color: colors.onSurface.withAlpha(100)),
           SizedBox(height: 6),
-          Text('添加图片', style: TextStyle(color: Color(0xFF86909C))),
+          Text('添加图片', style: TextStyle(color: colors.onSurface.withAlpha(100))),
         ],
       ),
     ),