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/components/children/ChildDialog.tsx

@@ -31,6 +31,7 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
     birthDate: '',
     gender: 'male',
     photoUrl: '',
+    photoAlt: '',
   });
   const [error, setError] = useState<string>('');
 
@@ -41,6 +42,7 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
         birthDate: child.birthDate.split('T')[0], // Convert to YYYY-MM-DD format
         gender: child.gender,
         photoUrl: child.photoUrl || '',
+        photoAlt: child.photoAlt || '',
       });
     } else {
       setFormData({
@@ -48,6 +50,7 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
         birthDate: '',
         gender: 'male',
         photoUrl: '',
+        photoAlt: '',
       });
     }
     setError('');
@@ -151,6 +154,8 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
             label={t('dialog.photoUrl')}
             value={formData.photoUrl || ''}
             onChange={(url) => setFormData({ ...formData, photoUrl: url })}
+            altText={formData.photoAlt || ''}
+            onAltTextChange={(altText) => setFormData({ ...formData, photoAlt: altText })}
             disabled={isLoading}
             size={80}
           />