feat(calc): add distinct count, median, std dev, and copy stats summary action (#573) - #589
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Summary
GridSelectionCalcEngineto compute:distinctCount(unique values in selection).median(sorted numerical midpoint calculation).stdDev(standard deviation for distributions).toSummaryString()formatted export string.DataGridCalcBarto show Count, Distinct, Sum, Avg, Median, Min, Max badges.test/features/main_screen/data_grid_engines_test.dart.Closes #573
Verification
flutter analyze lib/features/main_screen/passed with 0 issues.flutter test test/features/main_screen/data_grid_engines_test.dartpassed all 17 tests.