multiple inconsistencies fixed (AI)

webroot/js/calculator.js

@@ -140,11 +140,17 @@ export class Calculator {
     }
 
     setupEventListeners() {
-        // Event delegation for calculator buttons
+        // Event delegation for calculator buttons - only handle from active tab's calculator
         document.addEventListener('click', (e) => {
             // Only handle clicks on calculator buttons
             if (!e.target.classList.contains('calc-btn')) return;
             
+            // Verify the button is in the active tab's calculator (if app is initialized)
+            const activeContent = document.querySelector('.tab-content.active');
+            if (activeContent && !activeContent.contains(e.target)) {
+                return; // Button is not in active tab's calculator
+            }
+            
             const button = e.target;
             
             if (button.classList.contains('number')) {