Fix eye button hover and modal back button behavior

- Keep details panel showing sector info when hovering eye button
- Don't reset details when mouse moves from chart to eye button
- Close modals first when pressing browser back button

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

app.js

@@ -65,6 +65,25 @@ function navigateForward() {
 
 // Listen for browser back/forward via popstate
 window.addEventListener('popstate', function(e) {
+    // If a modal is open, close it and push state back to prevent navigation
+    const rowDetailModal = document.getElementById('row-detail-modal');
+    const transactionModal = document.getElementById('transaction-modal');
+
+    if (rowDetailModal && rowDetailModal.style.display !== 'none') {
+        closeRowDetailModal();
+        // Push state back to cancel the back navigation
+        history.pushState(e.state, '');
+        return;
+    }
+
+    if (transactionModal && transactionModal.style.display !== 'none') {
+        closeTransactionModal();
+        // Push state back to cancel the back navigation
+        history.pushState(e.state, '');
+        return;
+    }
+
+    // No modal open - handle drill-down navigation
     if (e.state && e.state.drillDown !== undefined) {
         const stateIndex = e.state.drillDown;
         if (stateIndex >= 0 && stateIndex < drillDownHistory.length) {
@@ -1468,6 +1487,7 @@ function setupHoverEvents(sunburstData, contextName = null) {
         // Track when mouse is over the button
         chartEyeBtn.addEventListener('mouseenter', () => {
             isOverEyeButton = true;
+            isInsideSection = true;  // Keep details panel showing sector info
             if (hideButtonTimeout) {
                 clearTimeout(hideButtonTimeout);
                 hideButtonTimeout = null;
@@ -1817,7 +1837,11 @@ function setupHoverEvents(sunburstData, contextName = null) {
     });
 
     // Also reset when mouse leaves the chart container entirely
-    chartDom.addEventListener('mouseleave', function() {
+    chartDom.addEventListener('mouseleave', function(e) {
+        // Don't reset if moving to the eye button
+        if (e.relatedTarget === chartEyeBtn || (e.relatedTarget && chartEyeBtn.contains(e.relatedTarget))) {
+            return;
+        }
         isInsideSection = false;
         showDefaultView();
     });