Added user avatar to header

Closes #18543

app/assets/stylesheets/framework/dropdowns.scss

@@ -20,7 +20,8 @@
 }
 .open {
-  .dropdown-menu {
+  .dropdown-menu,
+  .dropdown-menu-nav {
     display: block;
   }
@@ -66,7 +67,8 @@
   }
 }
-.dropdown-menu {
+.dropdown-menu,
+.dropdown-menu-nav {
   display: none;
   position: absolute;
   top: 100%;

app/assets/stylesheets/framework/header.scss

@@ -60,7 +60,7 @@ header {
         margin: ($header-height - 28) / 2 0;
         margin-left: 10px;
         height: 28px;
-        width: 28px;
+        min-width: 28px;
         line-height: 28px;
         text-align: center;
@@ -241,14 +241,23 @@ header {
     .navbar-collapse {
       padding-left: 5px;
-      li {
+      .nav > li {
         display: table-cell;
         width: 1%;
-
-        a {
-          margin-left: 8px !important;
-        }
       }
     }
   }
 }
+
+.header-user {
+  .dropdown-menu-nav {
+    width: 140px;
+    margin-top: -5px;
+  }
+}
+
+.header-user-avatar {
+  float: left;
+  margin-right: 5px;
+  border-radius: 50%;
+}

app/views/layouts/header/_default.html.haml

@@ -38,9 +38,17 @@
                 = link_to sherlock_transactions_path, title: 'Sherlock Transactions',
                   data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
                   = icon('tachometer fw')
-            %li
-              = link_to destroy_user_session_path, class: 'logout', method: :delete, title: 'Sign out', data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
-                = icon('sign-out')
+            %li.header-user.dropdown
+              = link_to current_user, class: "header-user-dropdown-toggle", data: { toggle: "dropdown" } do
+                = image_tag avatar_icon(current_user, 26), width: 26, height: 26, class: "header-user-avatar"
+                %span.caret
+              .dropdown-menu-nav.dropdown-menu-align-right
+                %ul
+                  %li
+                    = link_to "Profile", current_user
+                  %li.divider
+                  %li
+                    = link_to "Sign out", destroy_user_session_path, method: :delete, title: 'Sign out'
           - else
             %li
               %div