- New PATCH /api/children/[id] — updates image_url in children table
- New POST /api/children/[id] — returns presigned R2 URL for profile
photos (stored under profiles/{childId}/ prefix, no memories row)
- FamilyProvider: expose updateChildImage() so UI updates instantly
without a full re-fetch after upload
- Home page baby card: photo avatar is now a separate tap target from
the growth link. Tap photo → file picker → upload to R2 → save URL.
Camera overlay (📷) appears on hover/tap; ⏳ shown while uploading.
Tapping name/age/arrow still navigates to growth as before.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
