Use showConfirmModal() instead of browser confirm() for template overwrite (#53)

CreateTicketView.php was the one remaining spot using the native
confirm() dialog, violating README Dev Note #21. Split loadTemplate()
into a confirm check + applyTemplate(), routed through the project's
styled showConfirmModal(), matching every other destructive-action
confirmation in the app.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MGDKHiU5RJdo3dqQUDow3X

views/CreateTicketView.php

@@ -344,12 +344,23 @@ include __DIR__ . '/layout_header.php';
         var existingTitle = (document.getElementById('title').value || '').trim();
         var existingDesc  = (document.getElementById('description').value || '').trim();
         if (existingTitle || existingDesc) {
-            if (!confirm('Applying this template will overwrite your current title and description. Continue?')) {
-                document.getElementById('templateSelect').value = '';
-                return;
-            }
+            showConfirmModal(
+                'Overwrite content?',
+                'Applying this template will overwrite your current title and description. Continue?',
+                'warning',
+                applyTemplate,
+                function () { document.getElementById('templateSelect').value = ''; }
+            );
+            return;
         }
 
+        applyTemplate();
+    }
+
+    function applyTemplate() {
+        var tplId = document.getElementById('templateSelect').value;
+        if (!tplId) return;
+
         lt.api.get('/api/get_template.php?template_id=' + encodeURIComponent(tplId))
             .then(function (data) {
                 if (!data.success || !data.template) {