bug: Investment form state not cleared after successful submission — prefills old data

[sshdopey]

Problem

User completes investment, form still shows old values. Next investment form is cluttered.

[salienne]

@salienne has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi, I examined the issue report and understand the expected result. I can work on a solution that is clean, maintainable, and consistent with the project's standards.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @salienne to this issue.

[laurentketterle-hub]

@laurentketterle-hub has applied to work on this issue as part of the Stellar Wave Program's 7th wave

[laurentketterle-hub]

I claim this bounty. PR ready for review: #334