feat: Implement dynamic dashboard with tabs/cards for multi-child families

- Create DynamicChildDashboard component with tab view (1-3 children) and card view (4+)
- Integrate with Redux viewMode selector for automatic layout switching
- Update GraphQL dashboard query to include displayColor, sortOrder, nickname
- Replace static summary with dynamic multi-child dashboard
- Add child selection handling with Redux state sync
- Implement compact metrics display for card view
- Build and test successfully

maternal-web/graphql/queries/dashboard.ts

@@ -9,6 +9,9 @@ export const GET_DASHBOARD = gql`
         birthDate
         gender
         photoUrl
+        displayColor
+        sortOrder
+        nickname
       }
       selectedChild {
         id
@@ -16,6 +19,9 @@ export const GET_DASHBOARD = gql`
         birthDate
         gender
         photoUrl
+        displayColor
+        sortOrder
+        nickname
       }
       recentActivities {
         id