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/medicine/page.tsx

@@ -53,6 +53,10 @@ import { useTranslation } from '@/hooks/useTranslation';
 import { UnitInput } from '@/components/forms/UnitInput';
 import { convertVolume, convertTemperature } from '@/lib/utils/unitConversion';
 import { MeasurementSystem } from '@/hooks/useLocale';
+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';
 
 type MedicalActivityType = 'medication' | 'temperature' | 'doctor';
 
@@ -82,8 +86,15 @@ function MedicalTrackPage() {
   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[]>([]);
   const [activityType, setActivityType] = useState<MedicalActivityType>('medication');
 
   // Medication state
@@ -109,7 +120,6 @@ function MedicalTrackPage() {
   const [notes, setNotes] = useState<string>('');
   const [recentActivities, setRecentActivities] = useState<Activity[]>([]);
   const [loading, setLoading] = useState(false);
-  const [childrenLoading, setChildrenLoading] = useState(true);
   const [activitiesLoading, setActivitiesLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
   const [successMessage, setSuccessMessage] = useState<string | null>(null);
@@ -118,40 +128,28 @@ function MedicalTrackPage() {
   const [deleteDialogOpen, setDeleteDialogOpen] = useState(false);
   const [activityToDelete, setActivityToDelete] = useState<string | null>(null);
 
-  const familyId = user?.families?.[0]?.familyId;
-
+  // Load children from Redux
   useEffect(() => {
-    if (familyId) {
-      loadChildren();
+    if (familyId && children.length === 0) {
+      dispatch(fetchChildren(familyId));
     }
-  }, [familyId]);
+  }, [familyId, dispatch, children.length]);
+
+  // Sync selectedChildIds with Redux selectedChild
+  useEffect(() => {
+    if (selectedChild?.id) {
+      setSelectedChildIds([selectedChild.id]);
+    }
+  }, [selectedChild]);
 
   useEffect(() => {
-    if (selectedChild) {
+    if (selectedChild?.id) {
       loadRecentActivities();
     }
-  }, [selectedChild, activityType]);
-
-  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);
-    }
-  };
+  }, [selectedChild?.id, activityType]);
 
   const loadRecentActivities = async () => {
-    if (!selectedChild) return;
+    if (!selectedChild?.id) return;
 
     try {
       setActivitiesLoading(true);
@@ -159,7 +157,7 @@ function MedicalTrackPage() {
       const medicalTypes = ['medication', 'temperature', 'doctor', 'medicine'];
       const allActivities = await Promise.all(
         medicalTypes.map(type =>
-          trackingApi.getActivities(selectedChild, type as any).catch(() => [])
+          trackingApi.getActivities(selectedChild.id, type as any).catch(() => [])
         )
       );
 
@@ -185,7 +183,7 @@ function MedicalTrackPage() {
   };
 
   const handleSubmit = async () => {
-    if (!selectedChild) {
+    if (!selectedChild?.id) {
       setError(t('common.selectChild'));
       return;
     }
@@ -242,7 +240,7 @@ function MedicalTrackPage() {
         };
       }
 
-      await trackingApi.createActivity(selectedChild, {
+      await trackingApi.createActivity(selectedChild.id, {
         type: activityType,
         timestamp: new Date().toISOString(),
         data,
@@ -369,7 +367,9 @@ function MedicalTrackPage() {
     return 'Medical Record';
   };
 
-  if (childrenLoading) {
+  const childrenLoading = useSelector((state: RootState) => state.children.loading);
+
+  if (childrenLoading && children.length === 0) {
     return (
       <ProtectedRoute>
         <AppShell>
@@ -454,18 +454,21 @@ function MedicalTrackPage() {
 
           <motion.div initial={{ opacity: 0, y: 20 }} animate={{ opacity: 1, y: 0 }} transition={{ duration: 0.3 }}>
             {/* Child Selector */}
-            {children.length > 1 && (
+            {children.length > 0 && (
               <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>
             )}