optimize style sheets, support tabIndex in popup

lib/app/communications/style.scss

@@ -1,3 +1,5 @@
+@import "../../ui/css/functions/func.scss";
+
 .popup-mask .wrapper-edit-method {
     width: 100%;
 
@@ -32,10 +34,11 @@
         fill: var(--dark-fore-color);
         border-radius: 15px;
         border: none;
-        outline: none;
         transition: background-color .2s;
         user-select: none;
 
+        @include outline();
+
         &:hover {
             background-color: var(--dark-fore-opacity-color);
 
@@ -218,10 +221,7 @@
             font-size: var(--font-smaller-size);
             font-family: var(--font-family);
 
-            &:focus,
-            &:focus-visible {
-                outline: none;
-            }
+            @include outline();
         }
 
         >div {