Added user-controlled image adjustment modal that displays after item
confirmation, allowing users to adjust rotation/crop before final save.
Changes:
- AIOnboarding: wrapper confirmSingleItem to show modal post-selection
- State: showImageAdjustment, adjustingItemIndex, pendingItemData
- Handlers: confirm/cancel for applying or discarding adjustments
- Flow: item save → modal display → adjustments applied → DB commit
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>