perf(export): stream DataExportService file saves (#417) - #431
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saveToFile no longer builds a full-document String; CSV reuses writeResultGridCsv and JSON/Markdown/SQL write row-by-row with yields. Clipboard keeps isolate formatAsync (OS clipboard API). Closes #417
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Summary
DataExportService.saveToFilestreams viawriteToSink/IOSink(no giantString)writeResultGridCsv; JSON / Markdown / SQL write incrementally with yields every 500 rowsformatAsync) — noted in docs commentsCloses #417
Parent: #414
Test plan
flutter test test/shared/data_export_service_test.dart