Fix type errors in exporting history after manually adding peaks

[smoia]

Closes #76, #77, #78

@me-pic I went straight to the source of the problem - could you check if it works?
I think it's a more elegant solution than fiddling around downstream in the workflow.

Proposed Changes

Change Type

• bugfix (+0.0.1)
• minor (+0.1.0)
• major (+1.0.0)
• refactoring (no version update)
• test (no version update)
• infrastructure (no version update)
• documentation (no version update)
• other

Checklist before review

• I added everything I wanted to add to this PR.
• [Code or tests only] I wrote/updated the necessary docstrings.
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• [Documentation only] I built the docs locally.
• My contribution is harmonious with the rest of the code: I'm not introducing repetitions.
• My code respects the adopted style, especially linting conventions.
• The title of this PR is explanatory on its own, enough to be understood as part of a changelog.
• I added or indicated the right labels.

• I added information regarding the timeline of completion for this PR.

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[me-pic]

Good catch ! 🎉
Works fine for me !

[smoia]

@me-pic does it work fine for you? Can I merge after updating the zenodo?