feat: add function of fixing the head of tabs; ⭐

新增：固定页签头功能。

src/store/modules/setting.js

@@ -91,6 +91,9 @@ export default {
     },
     setActivatedFirst(state, activatedFirst) {
       state.activatedFirst = activatedFirst
+    },
+    setFixedTabs(state, fixedTabs) {
+      state.fixedTabs = fixedTabs
     }
   }
 }