feat: implement bilingual English/Spanish toggle with lossless i18n translation engine across all pages

app.js

@@ -246,10 +246,23 @@ document.addEventListener('DOMContentLoaded', () => {
       if (selectedSize === 'acreage' && !timeText.includes('Days')) {
         timeText = '1 - 2 Days (Full Crew)';
       }
+      if (document.documentElement.lang === 'es') {
+        timeText = timeText.replace(/Same Day/gi, 'Mismo Día')
+                           .replace(/Same-Day/gi, 'Mismo Día')
+                           .replace(/Hours/gi, 'Horas')
+                           .replace(/Days/gi, 'Días')
+                           .replace(/Routine/gi, 'Rutina')
+                           .replace(/\(Full Crew\)/gi, '(Equipo Completo)');
+      }
       timeDisplay.textContent = timeText;
     }
   }
 
+  // Listen for language changes to update localized calculator output
+  window.addEventListener('languageChanged', () => {
+    updateEstimate();
+  });
+
   // Listen to all calculator radio buttons
   const calcInputs = document.querySelectorAll('input[name="calc-service"], input[name="calc-size"], input[name="calc-condition"]');
   calcInputs.forEach(input => {