show outline for focused link. (#1181)

Author: sanxsth

src/common/copilot/user-feedback/feedback.css

@@ -33,3 +33,9 @@ body {
     outline-offset: 2px !important;
     border-radius: 2px;
 }
+
+a:focus {
+    color: var(--vscode-textLink-foreground);
+    outline: 2px solid var(--vscode-textLink-activeForeground);
+    outline-offset: 2px;
+}