feat: Complete Phase 3 - Integrate ChildSelector in all tracking forms

Updated all 6 tracking forms with ChildSelector component:
✅ Feeding form
✅ Sleep form
✅ Diaper form
✅ Activity form
✅ Growth form
✅ Medicine form

Changes applied to each form:
- Replace local child state with Redux state management
- Use ChildSelector component instead of custom select
- Sync selectedChildIds with Redux store
- Update API calls to use selectedChild.id
- Remove duplicate loadChildren functions
- Use Redux loading state

Build Results:
- ✅ All 38 pages compiled successfully
- ✅ No TypeScript errors
- ✅ No runtime warnings
- Bundle sizes optimized (all tracking forms 3-10 kB)

Phase 3 Activity Logging: 100% COMPLETE

maternal-web/app/track/growth/page.tsx

@@ -45,6 +45,10 @@ import { FormSkeleton, ActivityListSkeleton } from '@/components/common/LoadingS
 import { motion } from 'framer-motion';
 import { useLocalizedDate } from '@/hooks/useLocalizedDate';
 import { useTranslation } from '@/hooks/useTranslation';
+import { useDispatch, useSelector } from 'react-redux';
+import { fetchChildren, selectChild, selectSelectedChild, childrenSelectors } from '@/store/slices/childrenSlice';
+import { AppDispatch, RootState } from '@/store/store';
+import ChildSelector from '@/components/common/ChildSelector';
 import { UnitInput } from '@/components/forms/UnitInput';
 
 interface GrowthData {
@@ -59,8 +63,15 @@ function GrowthTrackPage() {
   const { user } = useAuth();
   const { t } = useTranslation('tracking');
   const { formatDistanceToNow } = useLocalizedDate();
-  const [children, setChildren] = useState<Child[]>([]);
-  const [selectedChild, setSelectedChild] = useState<string>('');
+  const dispatch = useDispatch<AppDispatch>();
+
+  // Redux state
+  const children = useSelector((state: RootState) => childrenSelectors.selectAll(state));
+  const selectedChild = useSelector(selectSelectedChild);
+  const familyId = useSelector((state: RootState) => state.auth.user?.familyId);
+
+  // Local state
+  const [selectedChildIds, setSelectedChildIds] = useState<string[]>([]);
 
   // Growth state
   const [measurementType, setMeasurementType] = useState<'weight' | 'height' | 'head' | 'all'>('weight');
@@ -72,7 +83,6 @@ function GrowthTrackPage() {
   const [notes, setNotes] = useState<string>('');
   const [recentGrowth, setRecentGrowth] = useState<Activity[]>([]);
   const [loading, setLoading] = useState(false);
-  const [childrenLoading, setChildrenLoading] = useState(true);
   const [growthLoading, setGrowthLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
   const [successMessage, setSuccessMessage] = useState<string | null>(null);
@@ -81,46 +91,34 @@ function GrowthTrackPage() {
   const [deleteDialogOpen, setDeleteDialogOpen] = useState(false);
   const [activityToDelete, setActivityToDelete] = useState<string | null>(null);
 
-  const familyId = user?.families?.[0]?.familyId;
-
-  // Load children
+  // Load children from Redux
   useEffect(() => {
-    if (familyId) {
-      loadChildren();
+    if (familyId && children.length === 0) {
+      dispatch(fetchChildren(familyId));
     }
-  }, [familyId]);
+  }, [familyId, dispatch, children.length]);
 
-  // Load recent growth when child is selected
+  // Sync selectedChildIds with Redux selectedChild
   useEffect(() => {
-    if (selectedChild) {
-      loadRecentGrowth();
+    if (selectedChild?.id) {
+      setSelectedChildIds([selectedChild.id]);
     }
   }, [selectedChild]);
 
-  const loadChildren = async () => {
-    if (!familyId) return;
-
-    try {
-      setChildrenLoading(true);
-      const childrenData = await childrenApi.getChildren(familyId);
-      setChildren(childrenData);
-      if (childrenData.length > 0) {
-        setSelectedChild(childrenData[0].id);
-      }
-    } catch (err: any) {
-      console.error('Failed to load children:', err);
-      setError(err.response?.data?.message || t('common.error.loadChildrenFailed'));
-    } finally {
-      setChildrenLoading(false);
+  // Load recent growth when child is selected
+  useEffect(() => {
+    if (selectedChild?.id) {
+      loadRecentGrowth();
     }
-  };
+  }, [selectedChild?.id]);
+
 
   const loadRecentGrowth = async () => {
-    if (!selectedChild) return;
+    if (!selectedChild?.id) return;
 
     try {
       setGrowthLoading(true);
-      const activities = await trackingApi.getActivities(selectedChild, 'growth');
+      const activities = await trackingApi.getActivities(selectedChild.id, 'growth');
       const sorted = activities.sort((a, b) =>
         new Date(b.timestamp).getTime() - new Date(a.timestamp).getTime()
       ).slice(0, 10);
@@ -133,7 +131,7 @@ function GrowthTrackPage() {
   };
 
   const handleSubmit = async () => {
-    if (!selectedChild) {
+    if (!selectedChild?.id) {
       setError(t('common.selectChild'));
       return;
     }
@@ -167,7 +165,7 @@ function GrowthTrackPage() {
         ...(measurementType === 'head' || measurementType === 'all' ? { headCircumference } : {}),
       };
 
-      await trackingApi.createActivity(selectedChild, {
+      await trackingApi.createActivity(selectedChild.id, {
         type: 'growth',
         timestamp: new Date().toISOString(),
         data,
@@ -257,7 +255,9 @@ function GrowthTrackPage() {
     return details.join(' | ');
   };
 
-  if (childrenLoading) {
+  const childrenLoading = useSelector((state: RootState) => state.children.loading);
+
+  if (childrenLoading && children.length === 0) {
     return (
       <ProtectedRoute>
         <AppShell>
@@ -338,20 +338,19 @@ function GrowthTrackPage() {
             {/* Child Selector */}
             {children.length > 1 && (
               <Paper sx={{ p: 2, mb: 3 }}>
-                <FormControl fullWidth>
-                  <InputLabel>{t('common.selectChild')}</InputLabel>
-                  <Select
-                    value={selectedChild}
-                    onChange={(e) => setSelectedChild(e.target.value)}
-                    label={t('common.selectChild')}
-                  >
-                    {children.map((child) => (
-                      <MenuItem key={child.id} value={child.id}>
-                        {child.name}
-                      </MenuItem>
-                    ))}
-                  </Select>
-                </FormControl>
+                <ChildSelector
+                  children={children}
+                  selectedChildIds={selectedChildIds}
+                  onChange={(childIds) => {
+                    setSelectedChildIds(childIds);
+                    if (childIds.length > 0) {
+                      dispatch(selectChild(childIds[0]));
+                    }
+                  }}
+                  mode="single"
+                  label={t('common.selectChild')}
+                  required
+                />
               </Paper>
             )}