feat: Complete comprehensive localization of all tracking and management pages

- Feeding page: 47+ strings localized with validation, success/error messages
- Medicine page: 44 strings localized with unit conversion support
- Sleep page: Already localized (verified)
- Diaper page: Already localized (verified)
- Activity page: Already localized (verified)
- AI Assistant: 51 strings localized including chat interface and suggested questions
- Children page: 38 strings fully localized with gender labels
- Family page: 42 strings localized with role management
- Insights page: 41 strings localized including charts and analytics

Added translation files:
- locales/en/ai.json (44 keys)
- locales/en/family.json (42 keys)
- locales/en/insights.json (41 keys)

Updated translation files:
- locales/en/tracking.json (added feeding, health/medicine sections)
- locales/en/children.json (verified complete)

All pages now use useTranslation hook with proper namespaces.
All user-facing text externalized and ready for multi-language support.

maternal-web/components/features/ai-chat/AIChatInterface.tsx

@@ -52,6 +52,7 @@ import { useAuth } from '@/lib/auth/AuthContext';
 import apiClient from '@/lib/api/client';
 import ReactMarkdown from 'react-markdown';
 import remarkGfm from 'remark-gfm';
+import { useTranslation } from '@/hooks/useTranslation';
 
 interface Message {
   id: string;
@@ -83,43 +84,9 @@ interface ConversationGroup {
   isCollapsed: boolean;
 }
 
-const suggestedQuestions = [
-  'How much should my baby sleep at 3 months?',
-  'What are normal feeding patterns?',
-  'When should I introduce solid foods?',
-  'Tips for better sleep routine',
-];
-
-const thinkingMessages = [
-  'Gathering baby wisdom...',
-  'Consulting the baby books...',
-  'Mixing up the perfect answer...',
-  'Warming up some advice...',
-  'Preparing your bottle of knowledge...',
-  'Counting tiny fingers and toes...',
-  'Connecting the building blocks...',
-  'Peeking into the toy box...',
-  'Arranging the puzzle pieces...',
-  'Stirring the baby food jar...',
-  'Polishing the pacifier of wisdom...',
-  'Tiptoeing through naptime...',
-  'Organizing the diaper bag...',
-  'Wrapping up your answer with love...',
-  'Brewing a warm cup of guidance...',
-  'Knitting together some thoughts...',
-  'Tucking in the details...',
-  'Sprinkling some magic dust...',
-  'Humming a lullaby while I think...',
-];
-
-// Get a random selection of 3-5 thinking messages
-const getRandomThinkingMessages = () => {
-  const count = Math.floor(Math.random() * 3) + 3; // 3 to 5
-  const shuffled = [...thinkingMessages].sort(() => Math.random() - 0.5);
-  return shuffled.slice(0, count);
-};
 
 export const AIChatInterface: React.FC = () => {
+  const { t } = useTranslation('ai');
   const [messages, setMessages] = useState<Message[]>([]);
   const [input, setInput] = useState('');
   const [isLoading, setIsLoading] = useState(false);
@@ -141,6 +108,43 @@ export const AIChatInterface: React.FC = () => {
   const theme = useTheme();
   const isMobile = useMediaQuery(theme.breakpoints.down('md'));
 
+  // Localized arrays that depend on translations
+  const suggestedQuestions = [
+    t('interface.suggestedQuestion1'),
+    t('interface.suggestedQuestion2'),
+    t('interface.suggestedQuestion3'),
+    t('interface.suggestedQuestion4'),
+  ];
+
+  const thinkingMessages = [
+    t('interface.thinking1'),
+    t('interface.thinking2'),
+    t('interface.thinking3'),
+    t('interface.thinking4'),
+    t('interface.thinking5'),
+    t('interface.thinking6'),
+    t('interface.thinking7'),
+    t('interface.thinking8'),
+    t('interface.thinking9'),
+    t('interface.thinking10'),
+    t('interface.thinking11'),
+    t('interface.thinking12'),
+    t('interface.thinking13'),
+    t('interface.thinking14'),
+    t('interface.thinking15'),
+    t('interface.thinking16'),
+    t('interface.thinking17'),
+    t('interface.thinking18'),
+    t('interface.thinking19'),
+  ];
+
+  // Get a random selection of 3-5 thinking messages
+  const getRandomThinkingMessages = () => {
+    const count = Math.floor(Math.random() * 3) + 3; // 3 to 5
+    const shuffled = [...thinkingMessages].sort(() => Math.random() - 0.5);
+    return shuffled.slice(0, count);
+  };
+
   const scrollToBottom = () => {
     messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' });
   };
@@ -243,10 +247,11 @@ export const AIChatInterface: React.FC = () => {
   // Group conversations by their group name
   const organizeConversations = (): ConversationGroup[] => {
     const groups: { [key: string]: Conversation[] } = {};
+    const ungroupedLabel = t('interface.ungrouped');
 
     // Separate conversations by group
     conversations.forEach((conv) => {
-      const groupName = conv.metadata?.groupName || 'Ungrouped';
+      const groupName = conv.metadata?.groupName || ungroupedLabel;
       if (!groups[groupName]) {
         groups[groupName] = [];
       }
@@ -262,8 +267,8 @@ export const AIChatInterface: React.FC = () => {
       }))
       .sort((a, b) => {
         // Ungrouped always last
-        if (a.name === 'Ungrouped') return 1;
-        if (b.name === 'Ungrouped') return -1;
+        if (a.name === ungroupedLabel) return 1;
+        if (b.name === ungroupedLabel) return -1;
         return a.name.localeCompare(b.name);
       });
 
@@ -372,7 +377,7 @@ export const AIChatInterface: React.FC = () => {
       const errorMessage: Message = {
         id: (Date.now() + 1).toString(),
         role: 'assistant',
-        content: 'Sorry, I encountered an error. Please try again.',
+        content: t('interface.errorMessage'),
         timestamp: new Date(),
       };
       setMessages((prev) => [...prev, errorMessage]);
@@ -390,10 +395,10 @@ export const AIChatInterface: React.FC = () => {
       <Box sx={{ p: 2, borderBottom: 1, borderColor: 'divider' }}>
         <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', mb: 2 }}>
           <Typography variant="h6" fontWeight="600">
-            Chat History
+            {t('history.title')}
           </Typography>
           {isMobile && (
-            <IconButton onClick={() => setDrawerOpen(false)} size="small" aria-label="Close drawer">
+            <IconButton onClick={() => setDrawerOpen(false)} size="small" aria-label={t('interface.closeDrawer')}>
               <Close />
             </IconButton>
           )}
@@ -405,7 +410,7 @@ export const AIChatInterface: React.FC = () => {
           onClick={handleNewConversation}
           sx={{ borderRadius: 2 }}
         >
-          New Chat
+          {t('chat.newChat')}
         </Button>
       </Box>
       <List sx={{ flex: 1, overflow: 'auto', py: 1 }}>
@@ -413,7 +418,7 @@ export const AIChatInterface: React.FC = () => {
           <Box sx={{ p: 3, textAlign: 'center' }}>
             <Chat sx={{ fontSize: 48, color: 'text.secondary', opacity: 0.3, mb: 1 }} />
             <Typography variant="body2" color="text.secondary">
-              No conversations yet
+              {t('history.noHistory')}
             </Typography>
           </Box>
         ) : (
@@ -434,7 +439,7 @@ export const AIChatInterface: React.FC = () => {
                 </ListItemIcon>
                 <ListItemText
                   primary={group.name}
-                  secondary={`${group.conversations.length} chat${group.conversations.length !== 1 ? 's' : ''}`}
+                  secondary={t('interface.chatCount', { count: group.conversations.length })}
                   primaryTypographyProps={{
                     variant: 'body2',
                     fontWeight: 600,
@@ -495,7 +500,7 @@ export const AIChatInterface: React.FC = () => {
                             }
                           }}
                           sx={{ ml: 1 }}
-                          aria-label={isMobile ? 'More options' : 'Delete conversation'}
+                          aria-label={isMobile ? t('interface.moreOptions') : t('interface.deleteConversation')}
                         >
                           {isMobile ? <MoreVert fontSize="small" /> : <Delete fontSize="small" />}
                         </IconButton>
@@ -566,10 +571,10 @@ export const AIChatInterface: React.FC = () => {
             </Avatar>
             <Box>
               <Typography variant="h6" fontWeight="600">
-                AI Parenting Assistant
+                {t('interface.assistantTitle')}
               </Typography>
               <Typography variant="caption" color="text.secondary">
-                Ask me anything about parenting and childcare
+                {t('interface.assistantSubtitle')}
               </Typography>
             </Box>
           </Box>
@@ -599,7 +604,7 @@ export const AIChatInterface: React.FC = () => {
             >
               <AutoAwesome sx={{ fontSize: 64, color: 'primary.main', opacity: 0.5 }} />
               <Typography variant="h6" color="text.secondary" textAlign="center">
-                Hi {user?.name}! How can I help you today?
+                {t('interface.greeting', { name: user?.name })}
               </Typography>
               <Box
                 sx={{
@@ -732,7 +737,7 @@ export const AIChatInterface: React.FC = () => {
                     transition: 'opacity 0.3s ease-in-out',
                   }}
                 >
-                  {currentThinkingMessages[currentThinkingIndex] || 'Thinking...'}
+                  {currentThinkingMessages[currentThinkingIndex] || t('chat.thinking')}
                 </Typography>
               </Paper>
             </Box>
@@ -758,7 +763,7 @@ export const AIChatInterface: React.FC = () => {
               fullWidth
               multiline
               maxRows={4}
-              placeholder="Ask me anything..."
+              placeholder={t('interface.inputPlaceholder')}
               value={input}
               onChange={(e) => setInput(e.target.value)}
               onKeyPress={(e) => {
@@ -795,24 +800,23 @@ export const AIChatInterface: React.FC = () => {
             </IconButton>
           </Box>
           <Typography variant="caption" color="text.secondary" sx={{ mt: 1, display: 'block' }}>
-            This AI assistant provides general information. Always consult healthcare professionals
-            for medical advice.
+            {t('interface.disclaimerFooter')}
           </Typography>
         </Paper>
       </Box>
 
       {/* Delete Confirmation Dialog */}
       <Dialog open={deleteDialogOpen} onClose={() => setDeleteDialogOpen(false)}>
-        <DialogTitle>Delete Conversation</DialogTitle>
+        <DialogTitle>{t('interface.deleteDialogTitle')}</DialogTitle>
         <DialogContent>
           <Typography>
-            Are you sure you want to delete this conversation? This action cannot be undone.
+            {t('interface.deleteDialogMessage')}
           </Typography>
         </DialogContent>
         <DialogActions>
-          <Button onClick={() => setDeleteDialogOpen(false)}>Cancel</Button>
+          <Button onClick={() => setDeleteDialogOpen(false)}>{t('interface.cancel')}</Button>
           <Button onClick={handleDeleteConversation} color="error" variant="contained">
-            Delete
+            {t('interface.delete')}
           </Button>
         </DialogActions>
       </Dialog>
@@ -837,7 +841,7 @@ export const AIChatInterface: React.FC = () => {
           <ListItemIcon>
             <DriveFileMove fontSize="small" />
           </ListItemIcon>
-          <ListItemText>Move to Group</ListItemText>
+          <ListItemText>{t('interface.moveToGroup')}</ListItemText>
         </MenuItem>
         <MenuItem
           onClick={() => {
@@ -851,7 +855,7 @@ export const AIChatInterface: React.FC = () => {
           <ListItemIcon>
             <Delete fontSize="small" />
           </ListItemIcon>
-          <ListItemText>Delete</ListItemText>
+          <ListItemText>{t('interface.delete')}</ListItemText>
         </MenuItem>
       </Menu>
 
@@ -862,7 +866,7 @@ export const AIChatInterface: React.FC = () => {
         maxWidth="xs"
         fullWidth
       >
-        <DialogTitle>Move to Group</DialogTitle>
+        <DialogTitle>{t('interface.moveToGroup')}</DialogTitle>
         <DialogContent>
           <List>
             <ListItemButton
@@ -875,7 +879,7 @@ export const AIChatInterface: React.FC = () => {
               <ListItemIcon>
                 <Chat />
               </ListItemIcon>
-              <ListItemText primary="Ungrouped" />
+              <ListItemText primary={t('interface.ungrouped')} />
             </ListItemButton>
             <Divider />
             {getExistingGroups().map((groupName) => (
@@ -898,13 +902,13 @@ export const AIChatInterface: React.FC = () => {
               <ListItemIcon>
                 <CreateNewFolder />
               </ListItemIcon>
-              <ListItemText primary="Create New Group" />
+              <ListItemText primary={t('interface.createNewGroup')} />
             </ListItemButton>
           </List>
         </DialogContent>
         <DialogActions>
           <Button onClick={() => setMoveToGroupDialog({ open: false, conversationId: null })}>
-            Cancel
+            {t('interface.cancel')}
           </Button>
         </DialogActions>
       </Dialog>
@@ -919,12 +923,12 @@ export const AIChatInterface: React.FC = () => {
         maxWidth="xs"
         fullWidth
       >
-        <DialogTitle>Create New Group</DialogTitle>
+        <DialogTitle>{t('interface.createNewGroup')}</DialogTitle>
         <DialogContent>
           <TextField
             autoFocus
             margin="dense"
-            label="Group Name"
+            label={t('interface.groupNameLabel')}
             fullWidth
             variant="outlined"
             value={newGroupName}
@@ -943,10 +947,10 @@ export const AIChatInterface: React.FC = () => {
               setNewGroupName('');
             }}
           >
-            Cancel
+            {t('interface.cancel')}
           </Button>
           <Button onClick={handleCreateNewGroup} variant="contained" disabled={!newGroupName.trim()}>
-            Create
+            {t('interface.create')}
           </Button>
         </DialogActions>
       </Dialog>