feat: integrate ImageAdjustmentModal into AIOnboarding flow

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>

.claude/settings.local.json

@@ -98,7 +98,8 @@
       "Bash(grep -E \"\\\\.tsx?$\")",
       "Bash(sqlite3 *)",
       "Skill(gsd-resume-work)",
-      "Bash(git revert *)"
+      "Bash(git revert *)",
+      "Skill(gsd-next)"
     ]
   }
 }