keplergl / kepler.gl / 23982786093

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fix(components): disable preserveDrawingBuffer by default for better performance (#3326)

preserveDrawingBuffer was hardcoded to true for the base map, causing a
known WebGL performance penalty on every frame. This option is only needed
for image export (canvas.toDataURL()), so we now only enable it when
isExport is true. The plot-container already sets isExport: true when
rendering for export, ensuring image export continues to work correctly.

Users who need preserveDrawingBuffer for other purposes can still override
it via bottomMapContainerProps.

Addresses #3237

Signed-off-by: pierreeurope <pierre.europe@pm.me>

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