fix: save and next button behavior

[blushi]

Description

Closes: #2290

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Author Checklist

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I have...

• provided a link to the relevant issue or specification
• provided instructions on how to test
• reviewed "Files changed" and left comments if necessary
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How to test

1. Go to https://deploy-preview-2298--regen-marketplace.netlify.app
2. Log in and go to https://deploy-preview-2298--regen-marketplace.netlify.app/profile/projects
3. Create a new project
4. Fill in the basic info form, adding some decimal value for the size and hit "save & exit"
5. This should save and go back to /profile/projects page

Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

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• confirmed all author checklist items have been addressed
• reviewed code correctness and readability
• verified React components follow DRY principles
• reviewed documentation is accurate
• reviewed tests
• manually tested (if applicable)

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[blushi]

@erikalogie see testing instructions

[erikalogie]

@blushi LGTM