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/locales/en/ai.json

@@ -58,5 +58,50 @@
     "safety": "Safety",
     "nutrition": "Nutrition",
     "general": "General"
+  },
+  "interface": {
+    "assistantTitle": "AI Parenting Assistant",
+    "assistantSubtitle": "Ask me anything about parenting and childcare",
+    "greeting": "Hi {{name}}! How can I help you today?",
+    "inputPlaceholder": "Ask me anything...",
+    "closeDrawer": "Close drawer",
+    "moreOptions": "More options",
+    "deleteConversation": "Delete conversation",
+    "chatCount": "{{count}} chat",
+    "chatCount_plural": "{{count}} chats",
+    "ungrouped": "Ungrouped",
+    "errorMessage": "Sorry, I encountered an error. Please try again.",
+    "disclaimerFooter": "This AI assistant provides general information. Always consult healthcare professionals for medical advice.",
+    "deleteDialogTitle": "Delete Conversation",
+    "deleteDialogMessage": "Are you sure you want to delete this conversation? This action cannot be undone.",
+    "cancel": "Cancel",
+    "delete": "Delete",
+    "moveToGroup": "Move to Group",
+    "createNewGroup": "Create New Group",
+    "groupNameLabel": "Group Name",
+    "create": "Create",
+    "suggestedQuestion1": "How much should my baby sleep at 3 months?",
+    "suggestedQuestion2": "What are normal feeding patterns?",
+    "suggestedQuestion3": "When should I introduce solid foods?",
+    "suggestedQuestion4": "Tips for better sleep routine",
+    "thinking1": "Gathering baby wisdom...",
+    "thinking2": "Consulting the baby books...",
+    "thinking3": "Mixing up the perfect answer...",
+    "thinking4": "Warming up some advice...",
+    "thinking5": "Preparing your bottle of knowledge...",
+    "thinking6": "Counting tiny fingers and toes...",
+    "thinking7": "Connecting the building blocks...",
+    "thinking8": "Peeking into the toy box...",
+    "thinking9": "Arranging the puzzle pieces...",
+    "thinking10": "Stirring the baby food jar...",
+    "thinking11": "Polishing the pacifier of wisdom...",
+    "thinking12": "Tiptoeing through naptime...",
+    "thinking13": "Organizing the diaper bag...",
+    "thinking14": "Wrapping up your answer with love...",
+    "thinking15": "Brewing a warm cup of guidance...",
+    "thinking16": "Knitting together some thoughts...",
+    "thinking17": "Tucking in the details...",
+    "thinking18": "Sprinkling some magic dust...",
+    "thinking19": "Humming a lullaby while I think..."
   }
 }