feat: US-005 - Frontend: Stats section collapse with chevron

dashboard/habits.html

@@ -1696,9 +1696,29 @@
             if (content.classList.contains('visible')) {
                 content.classList.remove('visible');
                 chevron.classList.remove('expanded');
+                // Save collapsed state to localStorage
+                localStorage.setItem('habits-stats-collapsed', 'true');
             } else {
                 content.classList.add('visible');
                 chevron.classList.add('expanded');
+                // Save expanded state to localStorage
+                localStorage.setItem('habits-stats-collapsed', 'false');
+            }
+        }
+        
+        function restoreWeeklySummaryState() {
+            const content = document.getElementById('weeklySummaryContent');
+            const chevron = document.getElementById('weeklySummaryChevron');
+            const isCollapsed = localStorage.getItem('habits-stats-collapsed');
+            
+            // Default is collapsed (isCollapsed === null means first visit)
+            // Only expand if explicitly set to 'false'
+            if (isCollapsed === 'false') {
+                content.classList.add('visible');
+                chevron.classList.add('expanded');
+            } else {
+                content.classList.remove('visible');
+                chevron.classList.remove('expanded');
             }
         }
         
@@ -2452,6 +2472,9 @@
             }
         });
         
+        // Restore collapsed/expanded state from localStorage
+        restoreWeeklySummaryState();
+        
         loadHabits();
     </script>
 </body>