report: fix focus in devtools, and in 3-dot menu (#16802)

Author: connorjclark

report/assets/styles.css

@@ -285,6 +285,10 @@
   --section-padding-vertical: 8px;
 }
 
+.lh-devtools :focus-visible {
+  outline: -webkit-focus-ring-color auto 1px;
+}
+
 .lh-container:has(.lh-sticky-header) {
   --sticky-header-buffer: calc(var(--topbar-height) + var(--sticky-header-height));
 }

report/assets/templates.html

@@ -224,7 +224,6 @@
       border: none;
       padding: 0;
       font: inherit;
-      outline: inherit;
     }
     .lh-tools__button svg {
       fill: var(--tools-icon-color);