Review and Adjust Sorting Logic and Cursor Management in contributions.ts

[coderabbitai[bot]]

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There is a potential issue with the sorting logic and cursor management in the contributions.ts file, specifically related to handling items with a null 'plantDate' and cursor management for gifts. This issue was identified during a pull request review.

The sorting logic is intended to place items with a null 'plantDate' at the beginning, but there seems to be a contradiction in the implementation. Additionally, the cursor management for gifts does not handle null 'plantDate' values effectively, potentially setting the cursor to null instead of a meaningful value.

For more context, see the pull request and the specific comment:

• PR: https://github.com/Plant-for-the-Planet-org/planet-webapp/pull/2040
• Comment: https://github.com/Plant-for-the-Planet-org/planet-webapp/pull/2040#discussion_r1559383769

This issue needs further investigation and potential adjustments to align with the intended functionality.