Fix focus trap to only include visible focusable elements

- Add getFocusableElements helper function
- Exclude input[type="hidden"] from selector
- Filter out elements where offsetParent is null (hidden)
- Filter out disabled elements

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

index.html

@@ -1157,10 +1157,12 @@
             document.getElementById('mainContent').setAttribute('inert', '');
 
             // Focus first focusable element in modal
-            const focusable = modal.querySelectorAll('button, input, select, textarea, [tabindex]:not([tabindex="-1"])');
+            setTimeout(() => {
+                const focusable = getFocusableElements(modal);
                 if (focusable.length > 0) {
-                setTimeout(() => focusable[0].focus(), 50);
+                    focusable[0].focus();
                 }
+            }, 50);
 
             // Add event listener for Escape key
             document.addEventListener('keydown', handleModalKeydown);
@@ -1181,6 +1183,13 @@
             }
         }
 
+        function getFocusableElements(container) {
+            const elements = container.querySelectorAll('button, input:not([type="hidden"]), select, textarea, [tabindex]:not([tabindex="-1"])');
+            return Array.from(elements).filter(el => {
+                return el.offsetParent !== null && !el.disabled;
+            });
+        }
+
         function handleModalKeydown(e) {
             if (!activeModalId) return;
             const modal = document.getElementById(activeModalId);
@@ -1194,7 +1203,7 @@
 
             // Trap focus on Tab
             if (e.key === 'Tab') {
-                const focusable = modal.querySelectorAll('button, input, select, textarea, [tabindex]:not([tabindex="-1"])');
+                const focusable = getFocusableElements(modal);
                 if (focusable.length === 0) return;
 
                 const first = focusable[0];