feat: donation form step 4

[benjaspet]

Description

This pull request adds the appropriate styling and components to closely match the Figma designs for the 4th step of the donation form, indicating a completed donation. It uses Tailwind & shadcn/ui to do so.

Changes Made

• Backend changes
• Frontend changes
• Database schema changes
• Configuration updates
• Other

Testing & Verification

• Unit tests pass
• Manual testing completed
• No breaking changes

Verification Steps:

1. Fill the donation form and create a donation.
2. Once submitting the donation, verify the 4th step page renders as shown below.

Screenshots (if relevant)

Future Improvements/Notes

Closer matching to the Figma for the "for making a difference" text might be possible.

Related Issues

Closes #46.