Issue #359 for jitter layer

[grantmcdermott]

pkgload::load_all('~/Documents/Projects/tinyplot')
#> ℹ Loading tinyplot

# boxplot + jitter
tinyplot(Sepal.Length ~ Species, data = iris, type = "boxplot")
tinyplot_add(type = "jitter", cex = 0.5, alpha = 0.3)

# violin + jitter (flipped)
tinyplot(Sepal.Length ~ Species, data = iris, type = "violin", flip = TRUE)
tinyplot_add(type = "jitter", cex = 0.5, alpha = 0.3)

^{Created on 2026-03-23 with reprex v2.1.1}