accounts: css adjustments

there is now a border between rows, on light mode a dashed line, on dark
a dotted (looks almost solid). Row height has been changed slightly,
too. Label and edit icon are back to being first after the username, and
the edit button is on the left now. Contact dropdowns now overflow out
of the table properly.

html/admin.html

@@ -802,7 +802,7 @@
                         <span class="button ~critical @low center " id="accounts-delete-user">{{ .quantityStrings.deleteUser.Singular }}</span>
                     </div>
                     <div class="card @low accounts-header table-responsive mt-2">
-                        <table class="table text-base leading-4">
+                        <table class="table text-base leading-5">
                             <thead>
                                 <tr>
                                     <th><input type="checkbox" value="" id="accounts-select-all"></th>