feat: Add comprehensive accessibility improvements and medical tracking

- **EULA Persistence Fix**: Fixed EULA dialog showing on every login
  - Added eulaAcceptedAt/eulaVersion to AuthResponse interface
  - Updated login/register/getUserById endpoints to return EULA fields
  - Changed EULACheck to use refreshUser() instead of window.reload()

- **Touch Target Accessibility**: All interactive elements now meet 48x48px minimum
  - Fixed 14 undersized IconButtons across 5 files
  - Changed size="small" to size="medium" with minWidth/minHeight constraints
  - Updated children page, AI chat, analytics cards, legal viewer

- **Alt Text for Images**: Complete image accessibility for screen readers
  - Added photoAlt field to children table (Migration V009)
  - PhotoUpload component now includes alt text input field
  - All Avatar components have meaningful alt text
  - Default alt text: "Photo of {childName}", "{userName}'s profile photo"

- **Medical Tracking Consolidation**: Unified medical page with tabs
  - Medicine page now has 3 tabs: Medication, Temperature, Doctor Visit
  - Backward compatibility for legacy 'medicine' activity type
  - Created dedicated /track/growth page for physical measurements

- **Track Page Updates**:
  - Simplified to 6 options: Feeding, Sleep, Diaper, Medical, Activity, Growth
  - Fixed grid layout to 3 cards per row with minWidth: 200px
  - Updated terminology from "Medicine" to "Medical"

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

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

maternal-web/app/track/page.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { Box, Typography, Grid, Paper } from '@mui/material';
-import { Restaurant, Hotel, BabyChangingStation, ChildCare, MedicalServices } from '@mui/icons-material';
+import { Restaurant, Hotel, BabyChangingStation, ChildCare, MedicalServices, TrendingUp } from '@mui/icons-material';
 import { useRouter } from 'next/navigation';
 import { AppShell } from '@/components/layouts/AppShell/AppShell';
 import { ProtectedRoute } from '@/components/common/ProtectedRoute';
@@ -32,7 +32,7 @@ export default function TrackPage() {
       color: '#F57C00', // Orange with 4.5:1 contrast
     },
     {
-      title: t('activities.medicine'),
+      title: t('activities.medical'),
       icon: MedicalServices,
       path: '/track/medicine',
       color: '#C62828', // Red with 4.5:1 contrast
@@ -43,6 +43,12 @@ export default function TrackPage() {
       path: '/track/activity',
       color: '#558B2F', // Green with 4.5:1 contrast
     },
+    {
+      title: t('activities.growth'),
+      icon: TrendingUp,
+      path: '/track/growth',
+      color: '#7B1FA2', // Purple with 4.5:1 contrast
+    },
   ];
 
   return (
@@ -60,7 +66,7 @@ export default function TrackPage() {
             {trackingOptions.map((activity, index) => {
               const IconComponent = activity.icon;
               return (
-                <Grid item xs={6} sm={4} lg={2.4} key={activity.title} sx={{ minWidth: 200 }}>
+                <Grid item xs={6} sm={4} md={4} key={activity.title} sx={{ minWidth: 200 }}>
                   <motion.div
                     initial={{ opacity: 0, scale: 0.9 }}
                     animate={{ opacity: 1, scale: 1 }}