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/common/PhotoUpload.tsx

@@ -19,6 +19,9 @@ interface PhotoUploadProps {
   label: string;
   disabled?: boolean;
   size?: number;
+  altText?: string;
+  onAltTextChange?: (altText: string) => void;
+  showAltText?: boolean;
 }
 
 export function PhotoUpload({
@@ -26,7 +29,10 @@ export function PhotoUpload({
   onChange,
   label,
   disabled = false,
-  size = 100
+  size = 100,
+  altText = '',
+  onAltTextChange,
+  showAltText = true,
 }: PhotoUploadProps) {
   const [imageError, setImageError] = useState(false);
   const [uploadError, setUploadError] = useState<string>('');
@@ -120,6 +126,7 @@ export function PhotoUpload({
         <Box sx={{ position: 'relative' }}>
           <Avatar
             src={!imageError && value ? value : undefined}
+            alt={altText || 'Profile photo'}
             sx={{
               width: size,
               height: size,
@@ -165,7 +172,19 @@ export function PhotoUpload({
           </IconButton>
         </Box>
 
-        {/* Photo URL field removed - users upload via camera icon only */}
+        {/* Alt text input for accessibility */}
+        {showAltText && onAltTextChange && (
+          <TextField
+            fullWidth
+            label="Photo description (for accessibility)"
+            placeholder="e.g., Smiling baby with blue eyes"
+            value={altText}
+            onChange={(e) => onAltTextChange(e.target.value)}
+            disabled={disabled}
+            helperText="Describe the photo for screen reader users"
+            size="small"
+          />
+        )}
       </Paper>
     </Box>
   );