Trey t 9c40721af0 feat(itinerary): add constraint-aware drag and drop with visual feedback ...

- Add constraint validation during drag using ItineraryConstraints
- Calculate invalid zones and barrier games when drag starts
- Apply visual dimming (alpha 0.3) to invalid drop zones during drag
- Highlight barrier games with gold border when dragging travel segments
- Block invalid drops using ItineraryConstraints.isValidPosition validation
- Add haptic feedback for drag interactions:
  - Medium impact on pickup
  - Light impact when entering valid zone
  - Warning notification when entering invalid zone
  - Soft impact on drop

The drag state is tracked via draggingItem, invalidRowIndices, and
barrierGameIds properties. Visual feedback is applied and removed
via applyDragVisualFeedback/removeDragVisualFeedback methods.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-17 21:59:57 -06:00

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