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Track Shopping List Cost

As a Host, I want to see estimated and actual costs for my shopping list, So that I can budget appropriately for the event.

Acceptance Criteria

Given I have a shopping list with items
When I view the shopping list
Then I can see:
- Estimated cost per item (based on historical data or manual entry)
- Total estimated cost for the entire list
- Total estimated cost by category
And I can optionally enter actual costs as I shop
And the system tracks variance between estimated and actual costs

Implementation Status

✅ IMPLEMENTED (January 2026)

Implementation Details

Files:

shaker/app/(tabs)/inventory/shopping/index.tsx - Cost display in summary
shaker/data/shopping-lists/index.ts - Summary calculation functions
shaker/types/shopping-list.ts - Cost tracking types
shaker/components/ProductSelectionModal.tsx - Actual cost entry

Features:

✅ Estimated cost per item
✅ Actual cost entry when checking off items (via ProductSelectionModal)
✅ Total estimated cost display
✅ Total actual cost display (when available)
✅ Cost variance tracking (shows both estimated and actual in summary)
✅ Category-level cost tracking in summary
✅ Price history integration when actual cost is entered

Implementation:

getShoppingListSummary calculates total estimated and actual costs
Summary card shows actual cost if available, otherwise estimated
Individual items show estimated cost (~$X.XX) or actual cost ($X.XX)
ProductSelectionModal allows entering actual cost when checking off
Actual cost is saved to price history when product is selected

Priority

Low - Nice to have for budgeting

ShoppingList, ShoppingListItem