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/page.tsx

@@ -98,7 +98,7 @@ export default function HomePage() {
     { icon: <Restaurant />, label: t('quickActions.feeding'), color: '#E91E63', path: '/track/feeding' }, // Pink with 4.5:1 contrast
     { icon: <Hotel />, label: t('quickActions.sleep'), color: '#1976D2', path: '/track/sleep' }, // Blue with 4.5:1 contrast
     { icon: <BabyChangingStation />, label: t('quickActions.diaper'), color: '#F57C00', path: '/track/diaper' }, // Orange with 4.5:1 contrast
-    { icon: <MedicalServices />, label: t('quickActions.medicine'), color: '#C62828', path: '/track/medicine' }, // Red with 4.5:1 contrast
+    { icon: <MedicalServices />, label: t('quickActions.medical'), color: '#C62828', path: '/track/medicine' }, // Red with 4.5:1 contrast
     { icon: <Insights />, label: t('quickActions.activities'), color: '#558B2F', path: '/activities' }, // Green with 4.5:1 contrast
     { icon: <SmartToy />, label: t('quickActions.aiAssistant'), color: '#D84315', path: '/ai-assistant' }, // Deep orange with 4.5:1 contrast
   ];