fix: Handle family data correctly during registration and onboarding

- Extract family data from registration response and add to user object
- Backend returns family separately in registration, but included in user for login
- Remove error messages for language/measurement preferences (they save correctly)
- Add detailed console logging for debugging family issues
- Improve error message when family is missing during child creation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/app/track/page.tsx

@@ -74,39 +74,36 @@ export default function TrackPage() {
                     onClick={() => router.push(option.path)}
                     sx={{
                       height: '100%',
-                      display: 'flex',
-                      flexDirection: 'column',
-                      alignItems: 'center',
-                      justifyContent: 'center',
+                      width: '100%',
                     }}
                   >
-                    <CardContent sx={{ 
-                      textAlign: 'center', 
-                      display: 'flex', 
-                      flexDirection: 'column', 
-                      alignItems: 'center', 
-                      justifyContent: 'center',
-                      width: '100%',
-                      height: '100%',
-                      p: 2, 
-                      '&:last-child': { pb: 2 } 
-                    }}>
+                    <Box
+                      sx={{
+                        textAlign: 'center',
+                        display: 'flex',
+                        flexDirection: 'column',
+                        alignItems: 'center',
+                        justifyContent: 'center',
+                        height: '180px',
+                        minHeight: '180px',
+                        width: '100%',
+                        p: 2,
+                      }}
+                    >
                       {option.icon}
                       <Typography 
                         variant="h6" 
                         fontWeight="600" 
                         sx={{ 
                           mt: 2,
-                          wordWrap: 'break-word',
-                          wordBreak: 'break-word',
-                          hyphens: 'auto',
                           textAlign: 'center',
                           width: '100%',
+                          lineHeight: 1.2,
                         }}
                       >
                         {option.title}
                       </Typography>
-                    </CardContent>
+                    </Box>
                   </CardActionArea>
                 </Card>
               </Grid>