Adds tagged code for cash management tutorial

[Profilist]

https://github.com/shop/issues-retail/issues/16100

Background

Added example components for a cash management extension in the Point of Sale UI Extensions documentation.

Linked to the tutorial in this PR.

Solution

Created a comprehensive cash management example for the Point of Sale UI Extensions documentation with the following components:

1. BannerAlert.tsx - A component that displays alert banners when business rules are violated (e.g., cash drawer amount outside of thresholds)
2. SafeModal.tsx - A modal interface for managing safe deposits and withdrawals with transaction history
3. useBusinessRules.ts - A custom hook that checks if cash drawer amounts violate business rules
4. InStoreCashInfo.tsx - A component that displays the total cash on hand in store
5. shopify.extension.toml - Configuration file that defines the extension targets

The example demonstrates how to implement cash management extensions that:

• Track safe balance, deposits and withdrawals
• Implement business rules to monitor cash drawer thresholds
• Use an alert system that displays banner warnings when business rules are violated
• Display total cash on hand at the location

🎩

• Run the example in a development environment to verify the cash management UI works correctly
• Test deposit and withdrawal operations to ensure balance updates properly
• Verify business rule alerts display correctly when thresholds are violated

Checklist

• I have 🎩'd these changes
• I have updated relevant documentation

[Profilist]

• Adds tagged code for cash management tutorial #3104 👈 (View in Graphite)
• unstable

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