style(frontend): change delete button to icon and rename actions column

frontend/src/components/TimeEntry/TimeList.jsx

@@ -77,9 +77,10 @@ const TimeList = ({ entries, onEntryDeleted }) => {
                                     {/* For now, just render button. */}
                                     <button
                                         onClick={() => handleDelete(entry.id)}
-                                        className="text-red-600 hover:text-red-900"
+                                        className="text-red-500 hover:text-red-700 font-bold text-lg"
+                                        title={t('list.delete') || 'Delete'}
                                     >
-                                        {t('list.delete') || 'Delete'}
+                                        ✕
                                     </button>
                                 </td>
                             </tr>