persisted selection of child and time range when switching between pages. Also added automatic total sleep time scaling on vertical axis

src/baby_monitor/static/feedings.html

@@ -304,9 +304,15 @@
 
       let allFeedings = [];
       let allChildren = [];
-      let currentDaysRange = 7;
+      let currentDaysRange = parseInt(localStorage.getItem("lastFeedingTimeRange")) || 7;
       let selectedChildId = null; // null means "All Children"
 
+      // Restore last selected child from localStorage
+      const lastChildId = localStorage.getItem("lastFeedingChildFilter");
+      if (lastChildId && lastChildId !== "all") {
+        selectedChildId = parseInt(lastChildId);
+      }
+
       // Load feedings data
       async function loadFeedings() {
         try {
@@ -348,12 +354,14 @@
 
       function onDaysRangeChange(event) {
         currentDaysRange = parseInt(event.target.value);
+        localStorage.setItem("lastFeedingTimeRange", currentDaysRange);
         displayFeedings(allFeedings);
       }
 
       function onChildChange(event) {
         selectedChildId =
           event.target.value === "all" ? null : parseInt(event.target.value);
+        localStorage.setItem("lastFeedingChildFilter", event.target.value);
         displayFeedings(allFeedings);
       }