feat: Integrate ChildSelector in diaper tracking 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 loadChildren function

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

@@ -48,6 +48,10 @@ import { childrenApi, Child } from '@/lib/api/children';
 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';
 
 interface DiaperData {
   diaperType: 'wet' | 'dirty' | 'both' | 'dry';
@@ -62,8 +66,15 @@ export default function DiaperTrackPage() {
   const { user } = useAuth();
   const { t } = useTranslation('tracking');
   const { formatDistanceToNow, format } = 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[]>([]);
 
   // Diaper state
   const [timestamp, setTimestamp] = useState<string>(
@@ -78,7 +89,6 @@ export default function DiaperTrackPage() {
   const [notes, setNotes] = useState<string>('');
   const [recentDiapers, setRecentDiapers] = useState<Activity[]>([]);
   const [loading, setLoading] = useState(false);
-  const [childrenLoading, setChildrenLoading] = useState(true);
   const [diapersLoading, setDiapersLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
   const [successMessage, setSuccessMessage] = useState<string | null>(null);
@@ -87,8 +97,6 @@ export default function DiaperTrackPage() {
   const [deleteDialogOpen, setDeleteDialogOpen] = useState(false);
   const [activityToDelete, setActivityToDelete] = useState<string | null>(null);
 
-  const familyId = user?.families?.[0]?.familyId;
-
   const availableConditions = [
     'normal',
     'soft',
@@ -98,19 +106,26 @@ export default function DiaperTrackPage() {
     'blood',
   ];
 
-  // Load children
+  // 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]);
 
   // Load recent diapers when child is selected
   useEffect(() => {
-    if (selectedChild) {
+    if (selectedChild?.id) {
       loadRecentDiapers();
     }
-  }, [selectedChild]);
+  }, [selectedChild?.id]);
 
   // Pre-fill form from URL parameters (voice command)
   useEffect(() => {
@@ -164,30 +179,12 @@ export default function DiaperTrackPage() {
     }
   }, [searchParams]);
 
-  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 || 'Failed to load children');
-    } finally {
-      setChildrenLoading(false);
-    }
-  };
-
   const loadRecentDiapers = async () => {
-    if (!selectedChild) return;
+    if (!selectedChild?.id) return;
 
     try {
       setDiapersLoading(true);
-      const activities = await trackingApi.getActivities(selectedChild, 'diaper');
+      const activities = await trackingApi.getActivities(selectedChild.id, 'diaper');
       // Sort by timestamp descending and take last 10
       const sorted = activities.sort((a, b) =>
         new Date(b.timestamp).getTime() - new Date(a.timestamp).getTime()
@@ -217,7 +214,7 @@ export default function DiaperTrackPage() {
   };
 
   const handleSubmit = async () => {
-    if (!selectedChild) {
+    if (!selectedChild?.id) {
       setError('Please select a child');
       return;
     }
@@ -247,7 +244,7 @@ export default function DiaperTrackPage() {
         data.rashSeverity = rashSeverity;
       }
 
-      await trackingApi.createActivity(selectedChild, {
+      await trackingApi.createActivity(selectedChild.id, {
         type: 'diaper',
         timestamp,
         data,
@@ -361,7 +358,9 @@ export default function DiaperTrackPage() {
     }
   };
 
-  if (childrenLoading) {
+  const childrenLoading = useSelector((state: RootState) => state.children.loading);
+
+  if (childrenLoading && children.length === 0) {
     return (
       <ProtectedRoute>
         <AppShell>
@@ -434,22 +433,21 @@ export default function DiaperTrackPage() {
             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>
             )}