fix(ena-planner): keep selected template after autosave refresh

modules/ena-planner/ena-planner.html

@@ -551,17 +551,19 @@
       });
     }
 
-    function renderTemplateSelect(selected = '') {
+    function renderTemplateSelect(selected) {
       const sel = $('ep_tpl_select');
+      const prev = sel?.value || '';
+      const target = typeof selected === 'string' ? selected : prev;
       sel.innerHTML = '<option value="">-- 选择模板 --</option>';
       const names = Object.keys(cfg?.promptTemplates || {});
       names.forEach(name => {
         const opt = document.createElement('option');
         opt.value = name;
         opt.textContent = name;
-        opt.selected = name === selected;
         sel.appendChild(opt);
       });
+      sel.value = names.includes(target) ? target : '';
     }
 
     /* ── Undo ── */