fix: add click handler support in simple grid table element

src/wuttaweb/templates/grids/table_element.mako

@@ -25,6 +25,9 @@
         % for action in grid.actions:
             <a v-if="props.row._action_url_${action.key}"
                :href="props.row._action_url_${action.key}"
+               % if action.click_handler:
+                   @click.prevent="${action.click_handler}"
+               % endif
                class="${action.link_class}">
               ${action.render_icon_and_label()}
             </a>