Fixes deletion functionality for order items across frontend and backend:
- Remove restriction preventing deletion of last item
- Add confirmation dialog before deletion
- Properly track and send deleted item IDs to backend via autosave
- Update backend to handle item deletion by ID instead of index
- Fix visual feedback: deleted items are hidden immediately
- Auto-recalculate total sum after deletion
Technical changes:
- order_form.html: Add confirmation dialog, trigger autosave on delete
- autosave.js: Collect deleted item IDs, send to backend
- draft_service.py: Process deleted_item_ids, update items by ID
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Co-Authored-By: Claude <noreply@anthropic.com>