fix: remove blue active state from zoom button and restore Show Zoom menu item

- Removed .zoom-active CSS class and JavaScript logic
- Zoom button stays same gray color whether zoom is on or off
- Fixed Show Zoom menu button visibility (changed inline style to zoom-hidden class)
- Menu item now correctly appears when zoom is hidden

templates/partials/navigation/hamburger-menu.html

@@ -73,7 +73,7 @@
                 <iconify-icon icon="mdi:arrow-expand-all" width="20" height="20"></iconify-icon>
                 <span>{{if eq .Lang "es"}}Expandir Todo{{else}}Expand All{{end}}</span>
             </a>
-            <a href="#" id="show-zoom-menu-btn" class="menu-item menu-item-action" style="display: none;">
+            <a href="#" id="show-zoom-menu-btn" class="menu-item menu-item-action zoom-hidden">
                 <iconify-icon icon="mdi:magnify" width="20" height="20"></iconify-icon>
                 <span>{{if eq .Lang "es"}}Zoom{{else}}Zoom{{end}}</span>
             </a>