refactor: 屏幕截图冗余区域字段收敛(action/position_img 并入截图区域), 仅框选区域模式显示

src/main/capabilities/vision.ts

@@ -212,8 +212,8 @@ register("Image_Screenshot", async (ctx, node, args) => {
   if (range === "2") {
     const regionRaw = text(args, ["position", "action", "position_img"]);
     if (!regionRaw.trim()) {
-      throw new RuntimeError("validation_error", "截图范围为「框选区域」时，position 需填写区域 JSON", {
-        recommendation: '在 position 填写 {"x":0,"y":0,"width":100,"height":80} 或 [x, y, width, height]，或将截图范围改回「整个屏幕」'
+      throw new RuntimeError("validation_error", "截图范围为「框选区域」时，截图区域需填写区域 JSON", {
+        recommendation: '在「截图区域」点屏幕框选，或填写 {"x":0,"y":0,"width":100,"height":80}，或将截图范围改回「整个屏幕」'
       });
     }
     if (screenOrigin) {