Fix: Default plotly.JSONDataset save encoding to UTF-8 #1205
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Description
Fixes #741.
The plotly.JSONDataset lacks a file encoding on save, resulting in a UnicodeDecodeError when reloading charts containing special characters on non-UTF-8 systems.
This PR resolves the bug by modifying the DEFAULT_FS_ARGS class attribute on line 55 to add encoding="utf-8" by default for save operations. This makes the save action consistent with the current utf-8 decode on load to provide consistent reliability.