Added "narrow" attribute to "button"

Sets .btn-icon class, which trims horizontal padding.
See https://tabler.io/docs/components/buttons#icon-buttons

Author: pchemguy

sqlpage/templates/button.handlebars

@@ -10,6 +10,7 @@
         {{~#if ../size}} btn-{{../size}}{{/if}}
         {{~#if outline}} btn-outline-{{outline}}{{/if}}
         {{~#if ../shape}} btn-{{../shape}}{{/if}}
+        {{~#if narrow}} btn-icon{{/if}}
         {{~#if space_after}} me-auto{{/if}}"
         {{~#if id}} id="{{id}}"{{/if}}
         {{~#if target}} target="{{target}}"{{/if}}