feat: VivesPOS landing on Winter CMS 1.2 — theme + plugin + Dockerfile

- Base: wintercms/winter branch 1.2 (full framework)
- Theme vivespos: Canvas 7 + Bootstrap 5 CDN, custom CSS
- Layout: deferred GTM/GA4 tracking, JSON-LD SoftwareApplication
- Partials: hero (offline-first), features, modes (offline/nube toggle),
  screenshots, pricing (3 planes), comparison, FAQ, CTA
- Plugin VivesPOS.Site with ContactForm
- Dockerfile: PHP 8.2 Apache, port 80, healthcheck
- Added winter/wn-pages, blog, sitemap, seo plugins
- Active theme set to vivespos

modules/system/assets/ui/js/checkbox.js

@@ -0,0 +1,86 @@
+/*
+ * Checkbox control
+ *
+ */
+
+(function($) {
+
+    $(document).on('keypress', 'div.custom-checkbox', function(e) {
+        if (e.key === '(Space character)' || e.key === 'Spacebar' || e.key === ' ') {
+            var $cb = $('input[type=checkbox]', this)
+
+            if ($cb.data('wn-space-timestamp') == e.timeStamp)
+                return
+
+            $cb.get(0).checked = !$cb.get(0).checked
+            $cb.data('wn-space-timestamp', e.timeStamp)
+            $cb.trigger('change')
+            return false
+        }
+    })
+
+    //
+    // Intermediate checkboxes
+    //
+
+    $(document).render(function() {
+        $('div.custom-checkbox.is-indeterminate > input').each(function() {
+            var $el = $(this),
+                checked = $el.data('checked')
+
+            switch (checked) {
+
+                // Unchecked
+                case 1:
+                    $el.prop('indeterminate', true)
+                    break
+
+                // Checked
+                case 2:
+                    $el.prop('indeterminate', false)
+                    $el.prop('checked', true)
+                    break
+
+                // Unchecked
+                default:
+                    $el.prop('indeterminate', false)
+                    $el.prop('checked', false)
+            }
+        })
+    })
+
+    $(document).on('click', 'div.custom-checkbox.is-indeterminate > label', function() {
+        var $el = $(this).parent().find('input:first'),
+            checked = $el.data('checked')
+
+        if (checked === undefined) {
+            checked = $el.is(':checked') ? 1 : 0
+        }
+
+        switch (checked) {
+
+            // Unchecked, going indeterminate
+            case 0:
+                $el.data('checked', 1)
+                $el.prop('indeterminate', true)
+                break
+
+            // Indeterminate, going checked
+            case 1:
+                $el.data('checked', 2)
+                $el.prop('indeterminate', false)
+                $el.prop('checked', true)
+                break
+
+            // Checked, going unchecked
+            default:
+                $el.data('checked', 0)
+                $el.prop('indeterminate', false)
+                $el.prop('checked', false)
+        }
+
+        $el.trigger('change')
+        return false
+    })
+
+})(jQuery);