feat: clear TomSelect input after exam selection

After pressing Enter to add an exam, the typed text is cleared
and the dropdown closes so the next code can be typed immediately.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

modules/turnero/views/recepcion.php

@@ -1032,7 +1032,7 @@ document.addEventListener('DOMContentLoaded', () => {
         plugins: ['remove_button'],
         maxOptions: null,
         selectOnTab: true,
-        onItemAdd:    () => recalcularPrecios(),
+        onItemAdd() { recalcularPrecios(); examTS.setTextboxValue(''); examTS.refreshOptions(false); },
         onItemRemove: () => recalcularPrecios(),
         onType(str) {
             if (!str) return;