fix: 截图目标文件路径兼容文件夹写法

- 目标文件路径语义为完整文件路径(含文件名), 提示文案不变
- 容错: 填的是已存在文件夹或以分隔符结尾时, 自动往里存默认文件名(screenshot_时间戳.png 或配置的文件名称), 不再报 EISDIR

src/main/capabilities/vision.ts

@@ -75,6 +75,18 @@ export function cropPng(source: PNG, region: { x: number; y: number; width: numb
   return cropped;
 }
 
+/** 目标路径容错：填的是文件夹（已存在或以分隔符结尾）时，自动往里存默认文件名 */
+async function resolveOutputPath(outputPath: string, defaultName: string): Promise<string> {
+  if (/[\\/]$/.test(outputPath)) return path.join(outputPath, defaultName);
+  try {
+    const stat = await fs.stat(outputPath);
+    if (stat.isDirectory()) return path.join(outputPath, defaultName);
+  } catch {
+    // 路径不存在说明是要新建的文件，原样返回
+  }
+  return outputPath;
+}
+
 register("Image_Screenshot", async (ctx, node, args) => {
   const folder = text(args, ["outImagePath", "folder"]);
   const name = text(args, ["outImageName", "name"], `screenshot_${Date.now()}.png`);
@@ -95,9 +107,12 @@ register("Image_Screenshot", async (ctx, node, args) => {
     image = PNG.sync.read(await fs.readFile(sourceFile));
     output = folder ? path.resolve(path.join(folder, name)) : sourceFile;
   } else {
-    // 当前屏幕来源：image_path 即保存路径，缺省用 输出目录+文件名；再缺省落流程证据目录（路径可预期）
+    // 当前屏幕来源：image_path 即保存路径（文件夹则自动追加默认文件名），缺省用 输出目录+文件名；再缺省落流程证据目录（路径可预期）
     image = await capturePrimaryScreenPng();
-    output = path.resolve(imageArg || (folder ? path.join(folder, name) : path.join(ctx.evidenceDir, name)));
+    output = await resolveOutputPath(
+      path.resolve(imageArg || (folder ? path.join(folder, name) : path.join(ctx.evidenceDir, name))),
+      name
+    );
   }
 
   if (range === "2") {