Cubo+rec 2 .CSV extension missing from the txn export file format.

[jm9151821]

Describe the bug
A clear and concise description of what the bug is.

When exporting the blink txn file, the file is not exported with the .csv extension, which can cause confusion and affect the user experience as some users may not be aware or know how to change the file extension.

To Reproduce
Steps to reproduce the behavior:

Export the Txn file. No extension will be shown.

Expected behavior
The file should be exported with .csv extension.

Screenshots
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YT Video: Rec 2

@siddhart1o1