fix(#24,#25,#26,#27,#30): action按钮顺序; group边界; Notification权限; queue catch; 新增功能测试

src/core.js

@@ -1018,7 +1018,7 @@ const meToast = {
     
     const t = this._emit({
       ...normalized,
-      html: _actionHTML(actions) + (normalized.html || ''),
+      html: (normalized.html || '') + _actionHTML(actions),
     });
     
     if (Array.isArray(actions)) {
@@ -1090,6 +1090,7 @@ const meToast = {
     });
     return {
       then: (fn, rj) => promise.then(fn, rj),
+      catch: (rj) => promise.catch(rj),
       cancel: () => { cancelled = true; },
     };
   },
@@ -1167,9 +1168,19 @@ const meToast = {
     const g = { _group: name };
     methods.forEach(m => {
       g[m] = (...args) => {
-        const last = typeof args[args.length - 1] === 'object' && args[args.length - 1] !== null && !Array.isArray(args[args.length - 1])
-          ? args.pop() : {};
-        return self[m](...args, { ...last, group: name });
+        const lastArg = args[args.length - 1];
+        const isObj = typeof lastArg === 'object' && lastArg !== null && !Array.isArray(lastArg);
+        // 单对象参数：直接合并group
+        if (isObj && args.length === 1) {
+          return self[m]({ ...lastArg, group: name });
+        }
+        // 末尾是配置对象：pop后合并
+        if (isObj) {
+          args.pop();
+          return self[m](...args, { ...lastArg, group: name });
+        }
+        // 无配置对象
+        return self[m](...args, { group: name });
       };
     });
     g.dismiss = () => self.dismissGroup(name);