back button and null selection

static/js/components/commandForm.js

@@ -18,7 +18,7 @@ window.renderBuildingDropdown = function() {
   const bData   = town.build_data || {};
   
   const currentVal = bSelect.value;
-  bSelect.innerHTML = '';
+  bSelect.innerHTML = '<option value="" disabled selected>-- Επιλέξτε Κατασκευή --</option>';
   
   for (const [key, nameGr] of Object.entries(window.BUILDING_NAMES_GR)) {
     const level = bLevels[key] !== undefined ? bLevels[key] : "?";
@@ -82,7 +82,7 @@ window.renderUnitDropdown = function() {
   const uData   = town.unit_data || {};
   
   const currentVal = uSelect.value;
-  uSelect.innerHTML = '';
+  uSelect.innerHTML = '<option value="" disabled selected>-- Επιλέξτε Μονάδα --</option>';
 
   for (const [key, nameGr] of Object.entries(window.UNIT_NAMES_GR)) {
     if (key === 'militia') continue;