constrain table width in checkup summaries

www/checkup/app-checkup.less

@@ -46,6 +46,9 @@ html, body {
         padding: 15px;
     }
 
+    .table-container {
+        overflow-x: auto;
+        width: 100%;
         table {
             td {
                 padding: 5px;
@@ -56,6 +59,7 @@ html, body {
                 word-break: break-word;
             }
         }
+    }
 
     .advisory-text {
         display: inline-block;

www/checkup/main.js

@@ -902,10 +902,12 @@ define([
 
         return h('div.error', [
             h('h5', obj.message),
+            h('div.table-container',
                 h('table', [
                     row(["Failed test number", obj.test + 1]),
                     row(["Returned value", h('pre', code(printableValue))]),
                 ]),
+            ),
         ]);
     };