Tune UI alignment for nav bar notification icon, avatar image, issue label (#17438)

web_src/less/_base.less

@@ -637,6 +637,7 @@ a.ui.card:hover,
 
   .fitted .svg {
     margin-right: 0;
+    vertical-align: middle;
   }
 
   .searchbox {

web_src/less/_repository.less

@@ -824,6 +824,7 @@
           width: 20px;
           height: 20px;
           margin: 0 .25rem;
+          vertical-align: middle;
         }
 
         &:first-child:not(.commit) {
@@ -2791,6 +2792,7 @@
 .labels-list .label {
   margin: 2px 0;
   display: inline-block !important;
+  line-height: 1.3em; // there is a `font-size: 1.25em` for inside emoji, so here the line-height needs to be larger slightly
 }
 
 tbody.commit-list {