Donation Summary & Fee Toggle Component

[thaninbew]

Summary:

Create a reusable component that displays donation total with optional transaction fee coverage and a toggle to add/remove the fee.

Behavior:

• Display base amount and calculated total
• Show fee breakdown when includeFee is true (e.g., "+$1.68 covers fees")
• Toggle switch with label + info tooltip linking to processor fee policy
• Precise fee calculation: fee = (baseAmount * feeRate) + fixedFee
• Use environment variables (.env) for fees (easy to update if Stripe changes rates), use 2.9% with a fixed fee of .30 for now.
• All amounts rounded to 2 decimals

Testing:

• Unit tests for fee calculations (various amounts)
• Toggle interaction and callback
• Snapshot for both states

Integration Notes:

• Should integrate with existing DonationForm component
• Stripe (as far as I know) doesn't have a way for us to fetch the fee of our transaction so it might be best to hardcode it in this case.